I think it is funny I ahd posted a thread on this same subject even when I had gotten burned badly when I was in the same situation with a girl in college.

The answer is to leave them alone, back away slowly and don't look back. Trust me once you stop lusting after your friend's girl you will kick yourself over all the cuties who wanted to get to know you better. I know because I do it all the time.

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Well sir that seems to be someone else's problem.