To get myself out of post-breakup funk, I used movie-watching as the most convenient way to distract myself. I avoided anything that reminded me of my ex in any way. Anything with a romantic element just brought out my cynicism.
So, I indulged in fantasies (sci-fi, anime, bad westerns, B&W war movies) and lots of classic and slapstick comedies (Marx Bros., Coen Bros., anything except "romantic comedies"). I highly recommend large doses of cheeziness and light-hearted humor.