I broke up with my ex so he went 4 me bff wat do i do?

Sounds like a lot of drama that you don't need. I'd say she isn't your bff if she is going out with the boy that you dated, whether you introduced them or not. And the fact that she made out with someone else just shows that he should be better off without her too. I'd say remove yourself from the whole situation, neither of them really know what they want and now it is kind of just between them. So just hangout with different people and maybe eventually your ex bff will realize what a mistake she made choosing a boy over a great friendship. Good luck.