Can’t think of very popular movie please help!

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Main character is some sort of cop but is (maybe?) actually in an insane Asylum where they’re trying to cure him. Please someone help me.

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“Shutter Island” (2010)
https://www.imdb.com/title/tt1130884/

If you think that this is your movie, then please select my answer as Best Answer, there is an option for that.

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