If she was crazy before and you broke up, she still is........
Sex is fun but it isn't a relationship. If you think you can live with her ( put up with ) for 40 years, cool, if not, that's just fun sex.
Really important life rule, "Don't stick * in crazy."
* Life choice involving many years of committed partnership. Probably money, definately children, as that seems to just happen.
My rule, Find someone you can disagree with, argue with, have fun times with. Build on that, be committed ( as many people feel I should be ! ), have fun, be happy.