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

I'll get straight to the point.<br><br>I (28M) discovered that my daughter (5F) isn't biologically mine after getting a DNA test done because I had suspicions. I was right and it hurt me more than anything else ever has.<br><br>I confronted my wife (27F) and she confessed to cheating on me with her ex. He's the father of my daughter but I've never hated the man so much that I would keep him from his daughter. I've come to terms with the fact that she's not mine and I still love her like my own but my wife has made this Phenomenal effort to make me feel guilty for wanting a divorce.<br><br>I told her I was filing for divorce and wanted full financial compensation because she's a SAHM while I work. She accused me of being a terrible father for wanting to tear our family apart like this. She even said I was a terrible person for wanting compensation from the mother of my "child" <br><br>She then told me that she was going to fight in court to not give me any money because I couldn't sue someone for something they can't pay. She said she was willing to go to court even if it meant breaking the bank and bankrupting themselves just to prove a point.<br><br>She also accused me of not loving our daughter because I was taking away her happy home by getting a divorce. Everytime I bring up the subject of divorce she refuses to listen and instead tells me not to abandon her and our daughter.<br><br>I've talked to the biological father and he's willing to get a paternity test done but he's also a bit confused on how to handle his new role as a parent.<br><br>What's the next move I can make to get out of this marriage ASAP. I'm tired of her using my daughter to make me stay and I don't know how much more of this I can take.<br><br>Edit: if you have any questions it's fine but I need some advice ASAP because things are getting to the point where I can't tolerate this anymore.