What philosophical theories fit into Groundhog Day?

Phil (the main character) changes thoughout the film. At first he is self absorbed, then when he relives every day he makes different choices and becomes happy, Then becoems depressed when Rita won't accept him, then finally starts treating other people differently and begins to enjoy his life, then his final awareness breaks him out of the loop of repetitions. I have an assignment to do where I must find 5 historically famous philosophers that match his different personalities as the movie progresses. Any ideas?