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Movie about a nerdy guy that is obsessed with the girl until he gets a girlfriend, But then the original girl he was obsessed with start stalking him

The nerdy, obsessive guy becomes much cooler somehow and writes a popular play or something like that. The original girl he was obsessed with then decides after seeing his play that she likes him after all But he's already gained a girlfriend so she becomes slightly obsessed with him.

If I remember right it's kind of a dark comedy because there are a number of lighthearted moments but at the same time some dark things happen in it.

If anyone can help me I'd really appreciate it. I know it's not a big blockbuster but maybe someone will of heard of it. Thanks a lot :-)
asked Jun 21, 2013 in Name That Movie by g_lantern2121 (20 points)
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