Aita for exposing my wife’s cheating and not wanting to do anything with a child that isn’t mine

So 2 weeks ago I found out that my 5 year old isn’t biologically mine, I felt so hurt and betrayed that my wife of 6 years relationship for 9 cheated on me and even got pregnant by another man, I took a paternity test without telling my wife

I immediately confronted my wife and called her a whore in my anger and many other names, she started crying and explained that she hid it because she didn’t want to break our happy family of 3, I asked her why did she cheat on me, she explained we had a very nasty argument back in the day so she hooked up with someone and it was just one time fling and has been loyal to me

She said she had doubts that I wouldn’t be the father but she never took paternity she said she was happy seeing me happy and didn’t go with abortion for peace of our family and didn’t tell me the truth

I told her I am divorcing and I don’t want to be in our son’s life, she started crying and begging me to not break the family and I am still his father and I have been a wonderful father and a husband I should forgive her and don’t let ‘dna’ Destroy our lives and started begging me

I immediately left and she was blowing up my phone, I decided at first not to tell anyone else but in the end I got very angry and decided to tell everyone, everyone is pissed at my wife

Her parents said they want nothing to do with their daughter and cut contact, my sister furiously called my soon to be ex and cursed her out, her brother and sister on the other hand said I have humiliated my soon to be ex and shouldn’t have told everyone and should have kept in between us

Yesterday her sister called me and said I need to take her back and come back for my son, I said I don’t have a son, she got angry and started cursing me and said I am a weak pathetic man no wonder my wife cheated on me and I am so pathetic I had to go behind my wife’s back to take paternity cause I am insecure and weak that I am giving up on my son just because we don’t share blood and I am the reason my wife is alone and depressed

I cut her call instead I called her husband and told him everything, i said that family is full of nutjobs, maybe it runs in their blood you should take a paternity as well and don’t trust those bitches, he said he’s sorry on his wife’s behalf and we ended the call

Now I am ignoring all my wife’s and that bitch’s calls