Theres quite a few things you should probably consider before getting your self into a situation like this, one of the biggest would be what kind of guy is her boyfriend. Is he the jealous type? My older step brother Pat got involved w/ a woman who had just broke up w/ her boyfriend a couple weeks earlier, Her ex was extremely jealous and obviously depressed and ended up shooting my brother in the back of his head, he was only in his young 20s and wanted to be a fire fighter, such a waste of life over something so stupid

. Its an extreme example but there are many bad things that could come from this. I would advise just keeping in touch but don't lead her on or influence her decision, if she ditches the guy wait a couple weeks/months and see if she is still interested.