cheating girlfriend next door

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I am searching for a quirky movie that I saw about 5 years ago. It might be from 2000-2010 range, but I am not sure.

There is a guy who is really upset because his girlfriend is cheating. He call her. He calls his best friend. He is suicidal in a hotel room I think. The twist is that the girl and friend are in the room next to him to have the affair. I think it might have had “next door” in title, but I cannot find it.

Hope you can identify it for me!

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pori Selected answer as best Dec 14, 2020