I want to break up with my fiance because of his violent and destructive son
could you please tell me more about the son ?
He has bad attendance, rarely learns the text, he fights with his classmates and some teachers, stalks girls
I'm sorry you are going through this. Have you and your fiance talked to the boy about his behavior? Maybe you can get him some help to figure out what is really going on.
We are a married and we are going to raise the kid till college.
It's okay to want to get out of a bad situation, but if you are married you should try and work things out for the sake of the relationship. I would find out if there are other things contributing to his behavior and try and work through them.