Originally Posted by
Winter-Dreams
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If you're that concerned with what this girl thinks, then it's probably a wise move to break up with your girlfriend. Even though this girl has a boyfriend and there's no particular indication that she's going to break up with him any time soon, the fact that you clearly want something to happen between the two of you says enough: you're already mentally single. Do the right thing and break up with your girlfriend before something happens and she gets hurt.
(I say this as someone who was in a very similar situation. I cheated, and felt terrible. I broke up with my boyfriend because I realised that just the desire to cheat alone was enough of an indication that I wasn't happy in the relationship)