What movie ends in a mental hospital with a portrait made on a door using meds a patient was supposed to take?

don: What movie ends in a mental hospital with a portrait made on a door using meds a patient was supposed to take?
It’s a love story between a girl that is house watching for somebody and one of the neighbors. But in the final part of the movie we see that the love story was only in her head, the guy being married and awaiting a child. She gets submitted after attacking the guy’s wife, and gets out of hospital with everyone fooled she is better. Instead of taking her medicine she made his portrait sticking them on a door. Please tell me the name of the movie.

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Answer by Viki
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