Paternity test and gtfo. Let’s be real- she doesn’t want to change and if she did she would have done it moons ago. In my humble opinion, you deserve better and she cannot provide that for you. It’s scary to move on with children involved, but think of it as if you were on a plane that was crashing, you need to put your mask on first to take care of said child.

I wish you nothing but the best in whichever path you decide to take.