Weird story check this out!! I need answers! Thanks crazy psychotic *****!!?

Ok.. My bf told me lastnight that when he was pcking his god brother up for work he Drove past his ex gf from around the corner from his god brothers house when he parked his ex was right behind his car ( weird) she said that her son might be his( mind you) his god sister told him the test was negative like around Christmas time and mind u that she lives across the street from her.. Getting to the point... Let me remind u she is very psychotic and muniplitive from my knowledge from what I've seen and heard from many ppl and since they've broken up which was years ago she has been very obsessed with him and won't stop and we'd problems because of it.... I suggest he change his number from years ago and I also suggested to beat her head in but I don't wanna catch a charge because she has mental issues ... I wanna do something about this so bad but haven't talked to anyone about it yet I'm very fed they've been broken up for 6 years and haven't touched or seen her since I need ideas opinions anything before I kill this phyco hoe.... Suggestions ??? Thanks very appreciated and thank u for kindness and patience ..... Xxxxxx<3