What should I do?

There is this girl who is in a relationship for 3 years now. But for the past 4 months they r in a distance relationship. And as far as i knew they ware very dedicated to each other, while her boyfriend was here in town. But for the past 1 month, we have been going out a lot and sleeping together. At first i though it was a one time thing. But i am starting to like it now. And i am sure she is too. But deep down i feel its wrong. As she is still his girlfriend. And she won't break up. Neither do i ask her to, cuz i don't want to complicate things. As i m still not sure if i really want this to happen in the long run. For can i trust her even if she breaks up n wants to stay with me?
What should I do?
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