If you are just a gf, I would stay out of it! That ish isn’t worth the stress if he hasn’t even made you a wife. Your bf needs to step up and take her to court so there’s an order granting him regular visitation. You can support him with that part but outside of that, the situation should not be your problem. Men who don’t take care of their business is so unattractive. It will only continue to get worse until he does what he is supposed to