Voted 5, but it's not an exact match - I'd probably still do her. I've had it off with girls with boyfriends before, and I feel like hell about it, but I'm weak and easily tempted. Only ever once cheated on a girl of my own, and its one of the worst feelings I've ever inflicted on myself - I never really forgave myself or got over it, and I highly doubt I'd ever cheat on a girl again.
Regards to the other discussion point, if it's classed as a 'relationship' then it doesn't matter how fresh it is - it's still cheating. It's gotta get to the relationship stage first, though - going on a few dates doesn't mean you're involved with someone.
Regards to the other discussion point, if it's classed as a 'relationship' then it doesn't matter how fresh it is - it's still cheating. It's gotta get to the relationship stage first, though - going on a few dates doesn't mean you're involved with someone.