i think you should be just as pissed at the dude. i mean, if he knew she was taken, then why the hell was he messing around with her? and for her, she still fucking did it. does she deserve another chance? i dunno. if you only been going out with her for like 6 months....shitty call man. my girlfriend and i are coming up on the 3 year mark in like 2 months....never done anything to lose trust, nor has she. thats what the caring is about, not just saying you care and slide around with other people...period. she fucking did it, so did he. either teach her the lesson, or get the fuck rid of her.