I like this girl who has a BF, what to do.?

She is a co-worker i'm 20 she's 19. Every time i see her we talk and share laughs. It's weird but even when i see look up sometimes i see her looking at me and we have a "moment", i do the same sometimes and she looks up but i'm kinda shy so i turn away. Today we talked about our families and i found of that we have a lot in common, she is in to hispanic guys ( a + for me) but the bad part for me is that she has a BF. I don't want to be the guy who breaks up a relationship b/c thats just not me, but on the other hand i'm falling for her every time i see her. I need advice...