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 try to keep this short. I have been married to my wife for 2 years but together for 6. We met when I was 22 and she was 21. She was pregnant when we met but gave birth to my son, "James" , when I was 23. He is a wonderful child that I raised as my own son. I love him more than life itself and I would die for him. <br><br>After some advice from another post, I had us all go to get DNA tests. A few months back, I got the results back and my wife essentially raised a failed test as her justification for saying it must be incorrect; I was so angry I didn't say anything but I knew I had to take a stand. My wife admitted that James wasn't biologically mine. He is the result of her affair with a man we now know is a sperm donor. She offered to take James to a neighbor's house but I told her I can take care of my son. She started trying to guilt me by saying that I was leaving her and how she can't take care of James on her own as she doesn't work and I am the only one who can find him in the evening. I still took care of James and the house but my wife could feel me acting differently, I didn't kick her out yet at this time but she must have figured that it was coming.<br><br>And then 2 months ago I told her that I wanted a divorce. She started screaming at me, saying she can't do it on her own and how she can't let James grow up in a divorced home. She started back with the tests, medical exams, and even blamed James' slight disability on being pregnant when she had him. I was at my wit's end and my wife started saying that if I didn't love her anymore I can let her out. I told her that I can't let her stay and she threatened to call her parents to come and get her because I "wasn't letting her leave" (she didn't understand that she wasn't being stopped from leaving, she was just being told that she had to either get the hell out or I would call the cops).<br><br>I don't want to get into any legal issues, what is my best move here? Should I get it over with and get a divorce now or try and wait it out?<br><br>**