If you're a guy, do you care if girl is in a relationship? I mean, would you wait for her to break up or not? And same goes for girls with guys.
My friend says all the time he'd never do anything if girl is in a relationship. Which I think it's weird. Is it?
The only answer I have to that question is that human beings are too fucking selfish. If she is selfish enough to only consider only her own feelings and cheat, why would you want to be with a douchebag scum? And yes, I know there are blurred lines, but at least have the courtesy to break up with other the person and save them from all the crap.
If she does the right thing and breaks up with the other person first, maybe I'd consider it. However, I would not be just sitting around waiting for that to happen. Next please! Too many hotties, so little time.