Eternal Sunshine of the Spotless Mind - Widescreen DVD Edition - Jim Carrey (2004)

This is the story of a guy, Joel, who discovers that his long-time girlfriend, Clementine, has undergone a psychiatrist's experimental procedure in which all of her memory of Joel is removed, after the couple has tried for years to get their relationship working fluidly. Frustrated by the idea of still being in love with a woman who doesn't remember their time together, Joel agrees to undergo the procedure as well, to erase his memories of Clementine.