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Relationships

Mumsnet has not checked the qualifications of anyone posting here. If you need help urgently or expert advice, please see our domestic violence webguide and/or relationships webguide. Many Mumsnetters experiencing domestic abuse have found this thread helpful: Listen up, everybody

BIL Text Me In Error-he is having an affair?

230 replies

Robertsmithsnan · 24/02/2026 06:48

I sent my BIL a message last week, my name starts with R.
Received a message at 7am, “R, you are the light of my life, I love you with all my heart”
He sent this to me by mistake.
The “R” person is someone he works with. What do I do?

OP posts:
dudsville · 24/02/2026 07:21

Forward it to his wife and be done.

Sowhat1976 · 24/02/2026 07:21

mcdog · 24/02/2026 06:50

Is he your BIL as in your sisters husband, or your husband’s brother?

That's my first question as well. If its my sister, I would absolutely tell her. If its my sister in law I would tell my husband to deal with. Although, if I was very good friends with the SIL I'd tell her.

SleafordSods · 24/02/2026 07:22

UpDownAllAround1 · 24/02/2026 07:09

How do you know it is someone he works with?

That was my first thought.

BlueEyedBogWitch · 24/02/2026 07:24

Screenshot it.
Reply, “I assumed this was for your wife, so I’ve sent it to her.”
Up to you whether you actually do that. I’d enjoy making the bugger sweat though.

FaintingGoats · 24/02/2026 07:27

What a weird message. I could see it being sent as a lighthearted response to a colleague who something like “sure I’ll give you a lift to work today” or “I’ve cancelled your 9am meeting” but it’s a weird affair text.

Topseyt123 · 24/02/2026 07:28

Whichever type of BIL he is (husband's brother or sister's husband), I would text back.

Something like "I've taken a screenshot of this. Speak to your wife now before I do it for you as you're clearly up to something."

Rudicoolcat · 24/02/2026 07:30

exhaustDAD · 24/02/2026 07:19

I thought the same.

Me too...

tartyflette · 24/02/2026 07:31

LoudSnoringDog · 24/02/2026 07:19

Imagine he might use this as his daft excuse

Yes, he's going to say it's a joke. And I suppose it could be, what with the excessively flowery language and all...

StillCreatingAName · 24/02/2026 07:36

It sounds like a sarcastic/jokey text between colleagues, probably in response to something they’ve done to help each other out- e.g. can you cover for me in X meeting, or do you mind if we cancel X today…that type of thing, otherwise it’s a little bit dramatic for affair banter.

Or do you already have your suspicions about BiL so affair is your immediate assumption?

Jane143 · 24/02/2026 07:36

Tumbler2121 · 24/02/2026 07:14

It could also be a joke message between colleagues if that’s the exact wording.

Yes it could be

Fends · 24/02/2026 07:38

Forward it straight to his wife. You can blame being half asleep and thinking it was for her but you only have a very short window for that option so do it now

JacknDiane · 24/02/2026 07:42

It does sound jokey to me

AnAppleAWeek · 24/02/2026 07:44

I wouldn’t do anything. If he really dose love this other woman with ‘all his heart’ I think his wife is going to hear about it soon enough.

HK04 · 24/02/2026 07:44

Just post back 3 question marks and let him explain.

bigboykitty · 24/02/2026 07:45

JacknDiane · 24/02/2026 07:42

It does sound jokey to me

Please explain how this very earnest message sounds jokey to you.

FloofBunny · 24/02/2026 07:45

If that was my sister's husband I would tell her immediately. Anything less would be a terrible betrayal.

SparklyGlitterballs · 24/02/2026 07:47

How do you know who your BIL works with?
Assuming SIL's name doesn't begin with 'R', does it begin with 'E' or 'T' and he's accidentally hit the wrong key on the keyboard?

If you're absolutely sure about his intentions then I'd respond with "That sinking feeling when you realise you've messaged your SIL instead of your bit on the side! Do you want to tell [name of SIL], or shall I?"

Having said that, what a weird phrase for someone to send "you are the light of my life". Makes me wonder if this is all BS.

livingthenotebook · 24/02/2026 07:49

Do you know the person R who he works with? It sounds sarcastic

HighStreetOtter · 24/02/2026 07:50

bigboykitty · 24/02/2026 07:45

Please explain how this very earnest message sounds jokey to you.

Because it’s too earnest. Too over the top. If a female colleague who I get on with picks some work up for me I message back saying “love you”. I don’t actually love them nor am I having an affair. It could be along those lines.

Harrietsaunt · 24/02/2026 07:51

I’m assuming your BIL has mentioned this work colleague rather too often, hence why you made this connection?

If he’s your sisters DH I would go straight to my sister. If DH brother, it would depend on my relationship with SIL whether I approached her directly or not.

ColdAsAWitches · 24/02/2026 07:51

bigboykitty · 24/02/2026 07:45

Please explain how this very earnest message sounds jokey to you.

Because it's so earnest! What man would ever text "You're the light of my life!"? It's deliberately overwrought language

DurhamDurham · 24/02/2026 07:52

Heck whoever it was meant for would surely get the ick from a message like that 😆

FantasyFoodhall · 24/02/2026 07:55

What was the message you sent him before this? Has he misunderstood and replied in a jokey way?

DeeperShadeOfBlu · 24/02/2026 07:55

How do you know it was a mistake. He might have been declaring it to you!

mindutopia · 24/02/2026 07:56

Is he at home now or at work or elsewhere? Because unless he is usually quite a romantic flowery writer, this sounds like his mates at work getting his phone to play a mean prank. I don’t think men typically speak like this, even to affair partners they are shagging behind their wife’s back. It sounds like something stupid and over the top that someone would say to take the piss if they got ahold of someone’s phone.