Jim Howard

An asshole who's never had a girlfriend, and thus chooses to be that annoying friend who hates anyone else in a relationship.

Girl 1: Did you hear about the guy who pulled a Jim Howard?
Girl 2: Yeah, he's so unhappy by himself that he decided to ruin his friend's relationship! What an asshole.
Girl 1: It's totally unforgivable when someone pulls a Jim Howard. How dare they do that to their friend?