When you start dating a woman and you care about her and things are going well, it can be so annoying when she has an ex-boyfriend that just will not let go and keeps bothering her and trying to get back with her. It can even put a steam on the relationship but on the other hand, has she made it clear to him that she has moved on and is no longer interested? We have to be fair in these kinds of situations because most of us have been an ex-boyfriend or girlfriend. There are some couples that decide to break up but still remain friends and some people cut off all contact completely and take the “I NEVER WANT TO SEE YOU AGAIN” stance now dependent on what happened and who broke it off is now going to affect how messy the break up is but the truth is your girlfriend’s ex is not your problem.
The only reason that a man needs to get involved in this is if he is physically threatening to harm her and in that case, you may need to help her or take the legal route.