Mine did cheat on me with and eventually go on to date someone who was "busted". I'd say it was probably worse than if she cheated with someone good looking.
See, if a chick chooses a busted dude, it could be a signal or about a personality issue. you said, "show her attention", that's prolly what the busted dude did...
If the dude looked good, you could at least hold your head up, but then again she still cheated.