'The Real World': Robb Bashes Himself In The Head With A Phone After Finding Out His Girlfriend Cheated (VIDEO)

If just thinking about hooking up with someone else while in a relationship is akin to really cheating on them, then Robb must have been dealing with some serious guilt. Either that, or it was full-on anger at his girlfriend back home on this week's "The Real World: St. Thomas" (Wed., 10 p.m. ET on MTV).

Robb's been developing some feelings for his roommate Marie, and he's been struggling with whether to act on them or be faithful to his girl back home. But then he found out on a phone call that she'd been unfaithful to him. Apparently, it was in retaliation, as she thought he'd cheated on her -- which as far as viewers could tell, he hadn't.

At first, he said he wasn't mad, but then he snapped and bashed himself over the head with the phone receiver and then beat it on his legs. All the while, his girlfriend was on the other end of the line asking what was wrong.

Was he angry that she had cheated? Or perhaps that she thought he had cheated? Or maybe even that he hadn't cheated, since she was apparently going to anyway?

"The Real World: St. Thomas" airs Wednesdays at 10 p.m. ET on MTV.

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