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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

The father of my son is being disloyal to his new girlfriend. Do I tell her?

68 replies

Bigmothahen · 17/07/2025 21:51

In need of other's opinions as I'm in a moral conundrum!

For context, my ex never wanted another child and changed from a genuine charming person to an irate, angry man when I told him I was pregnant. Attempting to be considerate, I told him I would not expect any money or support from him. Fast forward 6 months into my pregnancy, he admits he can't continue with the relationship and leaves. I understand and respect his wishes and we cease contact.

He attempted to contact me a couple of months later and again when my son was born. I eventually engaged in conversation with him again. His messages are flirtatious and many are sexual and explicit. I don't reciprocate as I have no intent on getting back into a relationship with this man, but I'm aware it'd be nice if he changed his mind and wanted to be in baby's life. Fast forward a matter of days, he decides he definitely doesn't want to be in baby's life and we cease contact in a civil manner.

Now here's my issue. Eventually it comes to light that this man has been in a relationship since he split with me... An established relationship announced on social media. I didn't see because I was blocked long before I knew about it and found out through friends. This whole time, he's been with this poor lady who's completely oblivious to his disloyalty to her and his messages to me. He never once mentioned this lady and made it clear he was "single".

If it were me, I know I'd want to know if my partner was being disloyal messaging others inappropriately and pretending to be single... But that's me.

So help me out... Do I leave this lady to be ignorant to this information? Or do I attempt to contact her to inform her that her partner has been disloyal to her? What would you do?

OP posts:
pizzaHeart · 18/07/2025 20:51

Biids · 17/07/2025 21:54

Be grateful to this other woman that she’s taking this utter dickhead off your hands.

And don’t tell her. You should probably not aggravate the relationship you have with your child’s father any further.

This ^
Always aim for drama free life, it’s much healthier

pizzaHeart · 18/07/2025 20:52

And by the way apply for child maintenance if he is on birth certificate if he is not it’s a different matter

ItsFreedomBabyYeah · 18/07/2025 20:54

I'm going against the grain here, but I would want to know if I was the gf. Tell her!

2025ismybestyear · 18/07/2025 20:55

Are you really that naive? He KNEW he wasn't infertile so the poor little lamb knew what could happen when he had sex without contraception. By not taking money from him you're denying your child. It's theirs. It's not for you to say no to. If you don't want it to use for nappies etc then save it for the baby.

Coffeislife · 18/07/2025 20:57

If you're thick of skin I would tell her.

  1. Being hes likely telling her he's infertile too and she may end up the same as you.
  2. As a woman I'd want to know early days rather then it coming out in the wash after wasted years.

She will either thank you for it or will call you crazy, if you know your own mind and can sit with the later I would tell her.

Zonder · 18/07/2025 22:19

Bigmothahen · 18/07/2025 20:48

On the financial point, I'm already second guessing my application to CMS... I may ring up to withdraw it. I honestly think he'd do everything in his power to make my life difficult out of anger of me going against my initial word regarding a financial contribution towards his son. As others have said, a decent human would offer to financially assist... The very fact he hasn't speaks volumes in how little he cares. I do think it'd open a can of worms I'm not ready for. With him caring so little there's no limit to how much he could attempt to fuck us up if I go against my word.

Please do not withdraw it. Don't let this man get away with all his crap when you have a baby he should be paying towards.

Malvaceae · 18/07/2025 22:21

pizzaHeart · 18/07/2025 20:51

This ^
Always aim for drama free life, it’s much healthier

This

Chiefly10 · 19/07/2025 09:20

Bigmothahen · 18/07/2025 20:48

On the financial point, I'm already second guessing my application to CMS... I may ring up to withdraw it. I honestly think he'd do everything in his power to make my life difficult out of anger of me going against my initial word regarding a financial contribution towards his son. As others have said, a decent human would offer to financially assist... The very fact he hasn't speaks volumes in how little he cares. I do think it'd open a can of worms I'm not ready for. With him caring so little there's no limit to how much he could attempt to fuck us up if I go against my word.

Don’t remove the application for CMS. Your son has a right to financial support from both parents. It is not fair on your child for you to withdraw. If he begins to threaten you in any way contact the police and women’s aid. Don’t meet him anywhere alone if he wants to meet to talk. Everything you have said about him says he can’t be trusted and you are fearful of his reaction to being expected to pay child maintenance which is his legal responsibility and not unreasonable in any way. Do you have any close family and friends that you can open up to and rely on for support?

abanemare · 19/07/2025 09:28

@BiidsSpot on, accurately described, waste of skin

abanemare · 19/07/2025 09:33

@BigmothahenYou should probably bite your tongue but wouldn't it be fun to screw him up ? Serial knob

cheesycheesy · 19/07/2025 09:35

Nothing to do with you. He’d likely paint you as the bitter ex. Just be happy he’s someone else’s problem!

cheesycheesy · 19/07/2025 09:37

And don’t withdraw financial claims. He needs to pay for his child, otherwise I assume it will be down to the tax payer.

MyDadWasAnArse · 19/07/2025 09:49

myplace · 18/07/2025 11:21

I’m a bit surprised you are still assuming he is a responsible man who would avoid making someone pregnant. Apart from his words, what gives you that impression?

He sounds like a Tom cat going around impregnating women all over the place.

researchers3 · 19/07/2025 10:15

Bigmothahen · 17/07/2025 22:19

I've let him off financially because when we were friends prior to our relationship together (I've known him for 4 years) he said he didn't want more children. He said he was infertile (me being naive I believed him!)

When we became very close in our relationship, we slept together unprotected because of his "infertile state" so my pregnancy was unexpected for him. I thought it unfair to have him pay for a child he never intended to have.

Surely your child will benefit from the money? You could save it for uni or whatever if you don't need it right now.

This man is no friend to anyone but himself.

I think you should forward her the messages. I'd want to know.

He sounds bloody awful and thank God he doesn't want to be in your child's life.

Mingusthebrave · 19/07/2025 10:16

And make sure you keep copies of messages and communications in case you ever need to go to court for custody or access. Keep a clear history of his intention of non-involvement, and particularly any threatening communications.

As for keeping him sweet by not going for CMS; nothing will keep him sweet! You can’t spend a lifetime trying to avoid conflict with him - but if he wants to cause trouble, he will. And a lifetime of anticipating his reactions or walking on eggshells is no way to live.

Let him know in practical terms that you’ve applied for CMS, prepare him and state clearly why - that it is for your child’s future. Make it clear that you don’t expect any day to day parenting input, nothing has changed on that front, and that you want nothing more from him except what your child is legally due to safeguard their future.

Keep your boundaries strong and read up on how to deal with a narcissist.

Move on with your life and enjoy your lovely child.

Tidekiln · 19/07/2025 10:22

I don't get either side of this- he didnt want a child but just assumed he was infertile and you had unprotected sex with him just going off his hunch that he was infertile. What do people expect to happen when you have unprotected sex!

happinessischocolate · 19/07/2025 11:02

Don’t tell her - father of my kids has had numerous girlfriends in the 21 years since we split and to my knowledge not been faithfull to any of them - dont waste your time especially if you hope that one day he’ll be there for your ds

onehorserace · 19/07/2025 11:21

Don't get involved in the drama. Concentrate on bringing up your child in the best way you can.

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