So wait.. you're telling me... that he didn't notice that she wasn't a virgin? HOW FU...... That right there, makes me want to smash my head through my wall...

Tell him, to grow the **** up. Yes she shouldn't have lied, blah blah blah blah, but if he's losing his shit over her girlfriend not being a virgin, then holy **** dude slap him up side the head. That isn't something to get upset about, unless she was cheating, now im assuming that she wasn't and just lied about not being a virgin because you didn't say anything about that she was. He can either let it go, and just move on, stay with her and forget about it, or dump her, either way though, it seems like he's going to have a hard time. You should knock some sense into him, take him to the bar or something if he's old enough.