Psychological or sociological movie about behaviour manipulation

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Hello. I need some help finding the name of a movie i saw in cable tv back in the early 2000s. It felt like a 90s movie but im unsure. The plot was about a guy who had a girlfriend in college I think. This guy gets targeted by a girl who ends up manipulating him to dump his girlfriend, change behaviours (tastes, clothing style, lifestyle too i think), then by the end of the movie he finds out that this girl had only been using him as a sort of sociological or psychological experiment for some sort of project that she presented to others. So im not too keen on the plot itself but that is what I remember. If anyone can help me I would very much appreciate it. Thanks.



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Any chance it's Single White Female?

https://en.wikipedia.org/wiki/Single_White_Female
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Hi. Thanks for the replies. I checked both movies trailers but they are not the one i was looking for.



Omg amazing you are a god xd. It is indeed The shape of things. And indeed I thought the plot was brutal after only watching it once. Thanks a lot.



Omg amazing you are a god xd. It is indeed The shape of things. And indeed I thought the plot was brutal after only watching it once. Thanks a lot.
Glad it was the right one. Your plot description was giving me flashbacks, LOL! All I could remember was being uncomfortable and also that Fred Weller was in it (as the main guy's friend).