I agree with penny on this one. While your friend fucked up you must have been really tight with him if he lived with you for two years, and i think you should give him a second chance. I mean he could have very well been a victim also, in the sense that he was really horney and she offered her self up to him. If you think about it i would have to say that probably 80% of men would fuck ANY hot girl that starts making advances toward him regardless of who the girl was in a relationship with. Like Raziel said it would not be worth the time atleast for the girl because you were only going out for seven months. I am just a little curious as to if you ever fucked her not to be nosey, but i mean i would definately have to change my opinion and say fuck them both if you never had sex with her and he fucks her.