I could use some ideas or advise on this.

[FartinMowler]

Your story sounds like you really aren't in the picture... YOu never stated that you where ever going out with her. You get angry at some guy that "YOu think"told her to ignore you (paranoia) and you claim that he dumped her and now is back with her (meaning that she liked him) and you you want to do something to this guy because? you where never in the picture. Go fish somewhere else because there are lots of fishies.