Is it wrong if I have a crush on my friend's girlfriend... she is so nice?

This is the only area I disagree with for others. I honestly believe in "alls fair in love and war". The fact is, if she ain't got a ring on her finger, I don't see why you can't act on it. Yes you'd be throwing your relationship away with your friend, but sometimes we have to find out if the risks are worth the effort. "The juice is worth the squeeze".

The way I see it, I ask myself if my friend would bother being noble on my girlfriend. In fact, I've had dozens of my friends hit on my ex's in the past. And I learned, love is truly a battlefield.

its fine if you have a crush on her but if you act on those feelings you might ruin your friendship.