I (28M) found out my son (5M) isn't biologically mine. My wife (27F) is trying to use our son to stop me from divorcing her. How should I proceed?

I'll get straight to the point.<br><br>I (28M) discovered that my wife Kat (27F) who I married 2 years ago but have been in a relationship with for 7 years cheated on me and that our son Lee (5) is not biologically mine.<br><br>I was given the revelation by my MIL. I would otherwise never have known because my wife and I are an interracial couple and our child is biracial. Just turns out the affair partner and bio father is also the same race as me. According to her, my wife confessed to her mother a year ago out of guilt. MIL wanted my wife to tell me directly but I guess after failing to do so for a year she took the initiative to tell me herself.<br><br>I took a DNA test and have confirmed that my son is in fact not mine.<br><br>I have confronted my wife who confessed to everything. Apologised for doing and then tried to ask me to reconsider my decision to divorce her. She said she wants to parent my son herself and that she "has been mmarried to me for essentially half his life. She also said she will make sure I am only peripherally involved in his life if I decide to leave her.<br><br>Before anyone at all says it - I honestly have no desire or ill will towards abandoning or breaking the family unit for my son. I love my son very much and I want him to have the best life possible. If I were to have died before realising this I have no doubt my wife would have hidden it from me.<br><br>When I told my wife I wanted to divorce her she nearly cried and started aplogising again which of course annoyed me. I told her my patience has ended and I now have to think about how to best navigate this situation. I told my wife I love my son and that I want him to have the best life possible and that I would like him to have a father figure who is biologically his own.<br><br>My wife replied that if I was to go through this, I would be risking my son losing two fathers because although his biological father is not a good man it means he is all my son would have by his biological father's side. I told my son he is my son, always going to be and I will love him without a shadow of a doubt for his entire life and will financially support him and that if he ever wants to reach out to me to talk I will be there. He was a bit upset that his biological father would not be attending his events but I explained to my son that his biological father is not a good man and that it is not his fault that he was born to someone who isn't me and that I want him to know and feel loved.<br><br>I have spoken to legal professionals, trust me I have tried to work on the basis of 50/50 custody from day 1. But my wife has so far in all her 2 meetings with my son and in her 1 meeting with my lawyer has made it very clear she does not want me to have anything remotely close to 50/50.<br><br>I am at the end of my rope and my family, friends and even my lawyer are telling me I should fight for custody. But the fact remains, my son's biological father does love him. To me it's an irrelevant argument because I will always be his dad but for my wife it's apparently wretched.<br><br>I must also consider my stepchildren. My wife told me she doesn't want me around for any major events but she said I can still lawfully attend minor ones, she means well but I don't want to set a precedent where I am in effect second fiddle to her and her biological son.<br><br>I don't know what to do. My son is my baby. His birthday was a week ago and he is just too precious to me. I love him more than life itself and I want him to have the best life possible. I want him to go to the school of his choice, I want him to have his own playstation and whatever else I can realistically afford to provide for him. I want him to succeed.<br><br>I know I should let him see my biological side. I know this. But I don't know how to tell him I want him to have a father but it isn't me.<br><br>I would very much like his life to remain as normal as it can be but I can't shake my wife's words. She said that would mean he would lose two fathers.<br><br>Tldr: I recently discovered my son is not biologically mine and now when I tell him I want to be his father he cries and says he will lose two fathers.