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To tell partner or keep it secret?

43 replies

Steelblue33 · 25/05/2026 09:55

I need other perspectives on a situation. My partner and I have been together for over 10 years. He has a brother who has a partner and they have been together a bit longer. She’s lovely. We get on really well.

Last year my partners mum died. She had cancer and has been having treatment for a few years. She lived on her own ever since her husband (my partners dad and brother’s dad) left her in the 90s for another woman.

My partners mum never got over what her ex husband did to her. She obsessed over it 20-30 years later. She would complain about their dad to me and tell me the same stories over and over again for years. She was basically broken by it and she would talk to me and her friends about it, but not her sons.

My partner didn’t want to hear it, not because he didn’t have sympathy but because he got sick of hearing the same stories over and over again. He also kept a good relationship with his dad. His view was that she wasn’t the only person in the world to get divorced and she needed to move on and enjoy life. His mum didn’t like that because she liked to stay in her state of feeling the victim (I mean she was, but it was a real struggle to listen to the same thing for years and years).

The brother didn’t want to hear about it either but because he hates his dad. He hated what he did to his mum (my view was this was caused by his mum). His mum said she didn’t like this and said she wanted them to reconcile, but I could tell that wasn’t really true. From the outside looking in I could tell that really she loved it. It gave her some power back. Her golden son (and he was the favourite - my partner knew that but didn’t care) was on her side, loyal and really took over the role of looking after her and being the man of the house. The consequence of this was that the son (partners brother) became her hero and really, they had an odd relationship. They were close but too close.

When my partners mum had treatment for her cancer the brothers shared looking after her and they were both a credit to her. However the brother would go and stay with her every weekend without fail. My partner would pop in every other weekend and covered staying with her in the week for chemo (he can WFH so had more flexibility). It was tough at times, but he made time for her, his hobbies and me. However the brother spent no time with his partner at the weekends. There were some weekends when their mum was absolutely fine, happy to be on her own and stocked up with food and in good place between chemo cycles etc, but he would still go. Fair enough, that’s what he wanted to do, but I knew from talking to his partner that she was frustrated and resented the situation. She understood the mother needed help and was on her own, but she basically got nothing from her partner for years (he had a very busy job in the week). But he would make her feel guilty if she raised it. His mum had cancer after all.

When my partners mum died my partner dealt with it well. He was sad but his view was that she was old, had been suffering and had a good life. It was her time and he’ll see her in the next life etc. He’d processed a lot of it in the years leading up to her death (we knew the prognosis). His brother was bad. He was off work for 6 months and remains on a phased return. He seems to be doing better slowly, but slowly.

I can tell that my partner’s brother thinks my partner doesn’t care. He thinks his reaction is normal and my partners isn’t. He also sometimes says things that indirectly basically say he was the hero and my partner wasn’t. He went every weekend etc. My partner feels this judgement because of this but doesn’t let it impact him too much (but I think it does sometimes).

The issue is that I’ve recently found out from the brother’s partner that she has just found out that for the last 4 years he’s been having an affair with someone 20 years younger than him. She hasn’t old anyone because she’s embarrassed and wants to protect her partner as she loves him. She really lacks self confidence significantly, hence her reaction. I don’t know what she will do but I can tell she’s angry. She suspected something but was told nothing was going on, how dare she ask etc. He has made a complete fool of her.

She is a lovely caring person, always puts other first and he’s completely taken advantage of her good nature. She tells me he is now panicking, doing the usual (being very nice, attentive, taking her away etc, all the things she ever wanted). He is also saying he wants to be a better person as he knows his mum is watching him etc - the family are religious. Wasn’t bothered before she died and before she was ‘watching’ him though..

The brother has always come across to me as arrogant. He’s in a prestigious profession (ironically the same as his dad - I think he secretly wants his dad’s approval) and tbh I can tolerate him, but I’ve always thought he was a bit of a stuck up t**t. He thinks he’s better than everyone.

Turns out he’d been telling his partner he was at his mum’s every Friday and Saturday night, but he was only there Saturday. Friday he was with OW for years.

For years I knew the partner resented the mum for having the brother all weekend every weekend, and I knew she (the mum) was worried the partner was resentful because she (the partner) never visited. When my partner wound go, I would often go with him. We dealt with it like a team and it also meant we were spending time together. However the brothers partner never did and now I know why. The brother kept her away and it didn’t become a thing for her to come too. It she did it would disrupt his perfect routine. He would go straight from OW to his mum on Saturday morning.

It makes me sad to think that they each thought each other had a problem with the other and really it was all due to the brother’s deceit and lies. I also feel deceived. He lied to us all. I also feel a bit stupid as I know the partner used to say to me she was annoyed he was there every Friday and Saturday, but I knew he always arrived Saturday morning. It never clicked, but then he was so good at hiding it.

I need advice regarding whether to tell my partner. It feels wrong that I know something so significant about his brother and he doesn’t, like I’m hiding something from him and I don’t like that in my relationship. I also think he deserves to know that the golden brother isn’t so golden. Their mum would be horrified by this. For obvious reason she hated cheating men. And the brother is such a hypocrite for hating his dad. Like father like son.

However the partner told me in confidence and she doesn’t want anyone to know. I don’t agree with her reasons (shame and wanting to protect him) but it’s not about me and I feel I should absolutely respect her wishes and not beach her trust. She hasn’t told anyone else so it’s important that trust isn’t broken. Also if I tell my partner, he’s then the one in a difficult position. He will know, but he won’t be able to tell his brother he knows. If I don’t tell him, he’s protected from that. He gets on well with his brother and I think it’s important that that continues (I think they would be ok if he knew though still - may just help change the dynamic to be in my partner’s favour rather than being the lesser person, something which I know the brother likes to use a bit sometimes power wise). My partner is the younger sibling and big brother has always been in charge/knows best.

Equally however the information I have could help free my partner from the ‘I’m big brother, I’m the best and I know the best’ dynamic.

Im leaning towards keep this to myself for now, keep under review, support brother’s partner as best I can objectively and without judgement, help her decide what she wants without any strong opinions, be civil with brother and know that if it ever comes out that I knew, I can explain my rationale to my partner (gave her my word and wanted to protect him from a tricky situation).

Does my judgment seem right? I just don’t think it’s my place to start something in train that really isn’t my business or my life. It’s up to them. In the meantime when brother is an ass/arrogant/looks down on me a bit like usual, it’s nice to know I will never let it impact me ever again! Any thoughts appreciated…

OP posts:
moderate · 26/05/2026 04:52

Another vote for informing your SIL that you can’t keep this from your partner, and then telling him.

Put it to her that you are not prepared for your partner’s trust in you to be wrecked by her cheating husband.

SeeYouThroughACameraFlash · 26/05/2026 05:18

I’d tell my partner because I wouldn’t risk our relationship for anyone else or their secrets.

Gossipisgood · 26/05/2026 10:48

Explain to the Brothers partner that you feel you're being deceitful to your Partner because you know what his Brother has been up to. Ask her if it's ok if you mention it to him see what she says. If she doesn't want you to tell him you need to respect her wishes. However, you could maybe drop into conversation that your Brother has been telling his Partner for years he's been with his Mum from Friday to Sunday when you both know he didn't get to his Mums til Saturday morning. Plant the seed so he may question his Brother himself. Could your Partner already know about the affaire? 4 years is s long time for the Brother to keep a secret like that.

moderate · 26/05/2026 11:33

Gossipisgood · 26/05/2026 10:48

Explain to the Brothers partner that you feel you're being deceitful to your Partner because you know what his Brother has been up to. Ask her if it's ok if you mention it to him see what she says. If she doesn't want you to tell him you need to respect her wishes. However, you could maybe drop into conversation that your Brother has been telling his Partner for years he's been with his Mum from Friday to Sunday when you both know he didn't get to his Mums til Saturday morning. Plant the seed so he may question his Brother himself. Could your Partner already know about the affaire? 4 years is s long time for the Brother to keep a secret like that.

Don’t ask, tell. She didn’t ask your permission to put you in a position of keeping secrets from your partner.

Steelblue33 · 26/05/2026 19:21

I’ve told him. Couldn’t keep it from him anymore. He’s glad I did and so am I. I will tell her and I think she will understand. Like a PP said, I didn’t ask for this. It’s also such a relief having someone to talk to about it and I thought I couldn’t risk my own relationship for their secret. I can and will also support her as best I can. I also wondered if she subconsciously picked me because I may tell my partner, and it will come out. She’s holding it all in and keeping up appearances at the moment but I can’t imagine how hard that is. She’s been doing it for months.

Yes I beached her trust in a way, but she just told me. She didn’t say if I tell you something can you keep it secret.

I’m comfortable with my decision and it’ll get worked through.

Thanks for all your perspectives. Bit of a lose lose situation really but I’ve done what feels best.

OP posts:
OlderGlaswegianLivingInDevon · 26/05/2026 19:28

That poor woman.

What is she going to do - leave him

so much use of the word ' partner ' so i guess no one is married so she won't need to divorce him

Are there children involved ?

Clearsky01 · 26/05/2026 19:29

You were right to tell him.

ThatJadeLion · 26/05/2026 19:49

Absolutely not a chance should you feel obligated to keep this from your husband. Nor should you be put in the position to be expected to do so. Just my opinion.

ThatJadeLion · 26/05/2026 19:50

Just read the update, I think you did the right thing.

sunhat100 · 26/05/2026 20:05

Steelblue33 · 26/05/2026 19:21

I’ve told him. Couldn’t keep it from him anymore. He’s glad I did and so am I. I will tell her and I think she will understand. Like a PP said, I didn’t ask for this. It’s also such a relief having someone to talk to about it and I thought I couldn’t risk my own relationship for their secret. I can and will also support her as best I can. I also wondered if she subconsciously picked me because I may tell my partner, and it will come out. She’s holding it all in and keeping up appearances at the moment but I can’t imagine how hard that is. She’s been doing it for months.

Yes I beached her trust in a way, but she just told me. She didn’t say if I tell you something can you keep it secret.

I’m comfortable with my decision and it’ll get worked through.

Thanks for all your perspectives. Bit of a lose lose situation really but I’ve done what feels best.

Well done. It was the right thing to do babe. Not your s ecret, not your shame, just wait till it comes out, how embarrassing will that be for everyone to know what he's done, and in such a slimy awful disrespecting way towards your mum. He must have felt untouchable and extremely big and powerful

TY78910 · 26/05/2026 20:16

Esmeraldathe3rd · 25/05/2026 10:09

Alot of irrelevant nonsense in there. You've been told in confidence by SIL that BIL is having an affair. And you're wondering if you should share that information with other people behind her back after she's specifically asked you not to. No.

I actually enjoyed reading it - even did a little mmmmhm when I got to the part OP said she feels deceived about how BIL made everyone feel like a sack of shit but the whole time he was bonking someone else!!

OP, I would say just that - explain to SIL that actually, DH has been really affected by the way his brother made it out he didn’t care over the years, even though the whole time he was pretending he was there for MIL when he was deceiving you. I have to tell him to lift that burden from him. Happy for you to do it, I can do it, we can do it together etc.

  • this ever comes out that you knew, your relationship is in the toilet
TY78910 · 26/05/2026 20:18

Ah just read your update!

how did DH take it?

Lifestooshort71 · 27/05/2026 06:22

You did the right thing but I would tell SIL asap - she has had enough humiliation without finding out at a later date that there's been yet another secret. Hopefully your partner will be supportive of her, sometimes blood isn't thicker than water and his brother has been a total shit.

Steelblue33 · 27/05/2026 10:44

My partner was shocked but not too surprised. Had no idea though. I suppose not surprised in that he wouldn’t put it past him? Defo feels like he doesn’t know who his brother is, very angry he used his mum’s illness to cover and particularly angry that his mum worried about the partner not liking her (she was a big worrier) and his brother let that happen.

They’re not married and don’t have kids but I think that’s a double edged sword for her. A PP asked about kids and it’s made me realise something very significant for her in all this. She wanted kids, he didn’t (was always open about that so fair enough) but she wanted him more. Now I fear it’s too late for her ☹️.

OP posts:
lonelyplanetmum · 27/05/2026 10:50

Poor woman. She didn’t have children because of him. How old is she, is it really too late for her to find someone else? If she really wanted them it’s a big regret to have, and she doesn’t sound confident enough to adopt on her own or something.

KarmenPQZ · 27/05/2026 13:54

No. She’s basically asked you to be loyal to her above and beyond your loyalty to your partner. That doesn’t sit right with me especially as she chose to tell you when presumably she could have confided in other people she knew (or even Mumsnet).

I think unless your partner can’t be trusted to go over and pick a fight with his brother you should tell him. Especially as it’s going to come out eventually and when he finds out you chose loyalty to SIL above him and that would rightly be a relationship ending reveal in my opinion

ETA sorry I missed the update.

OhThePotential · 01/06/2026 04:30

Esmeraldathe3rd · 25/05/2026 10:09

Alot of irrelevant nonsense in there. You've been told in confidence by SIL that BIL is having an affair. And you're wondering if you should share that information with other people behind her back after she's specifically asked you not to. No.

Thank you - I gave up about a third into it.

OP, its not all relevant and it is far too long.

Beenwhereyouareagain · 01/06/2026 05:23

Steelblue33 · 25/05/2026 10:12

It’s all of relevance to the reasons either way. Lots to think about. No need to be passive aggressive.

No need to be passive/agressive?

You're replying to @Esmeraldathe3rd, who said "You've been told in confidence by SIL that BIL is having an affair. And you're wondering if you should share that information with other people behind her back after she's specifically asked you not to. No."

Why would you say that to her? NO is not passive/aggressive.

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