I (42M) found out my daughter (18F) wasn’t mine in 2020. I tried to reassure her that I still loved her and will always be her dad.

However a couple of years ago , she found her biological family online and started a relationship with them. Despite not being all that pleased with it, I tried to put my unhappiness to one side for her sake. At first it was contact with cousins, then half siblings then father. They all live in another part of the country.

She’s been talking about going to university her whole life and she had been making applications. I recently saw an offer for her top choice. I didn’t clock on at first but I realised after a while that the university were she’s going is in the same city where her family and father live.

So when I asked her about it, she was like well yeah, I want to go to be closer to my family and get to know them all a lot better. She also said she’s going to live with her half siblings rather than in student accommodation.

She could tell I was definitely upset and she was saying I’ll still come back home and visit, we’ll still have a relationship. I sort of snapped and told her we won’t have a relationship let’s face it, she should just be honest about it. She got upset and went to stay at her mum’s (my ex) who rang me to try and have a go at me saying I upset our daughter. I corrected her saying her daughter and she’s to blame for this not keeping her legs closed. She called me a cunt and hung up.

They’ve evidently got in touch with my parents who are trying to “talk Sense” into me – despite my mum particularly usually hating my ex.

. AITAH for what I said?

Edited to add because I’m tired of justifying it yes he knew she was married, he knew he made a kid and yes, he was aware he was cheating with a married woman.