Just let it. Cause if he really cared about you at all, he would have pushed her away. He would have already known that it was wrong and told her to back off, but he didn’t. Instead, he let her get to him and take him away from you. You don’t want a guy like that. You want a guy who knows right from wrong and the fact that he should never leave his girl for someone better. Ever. A real man wouldn’t do that, especially to girl he should have been loyal to.