Help me out again!

Two more film lists for Roo4:

Movies where the safe responsible boyfriend or
husband turns out to be a closet jerk, thus transforming himself into the
rotten boyfriend -- thus freeing the heroine to
leave him for someone more exciting, guilt-free: Desperately Seeking Susan; The Wedding Singer; Moonstruck...




WHAT ELSE? I know there are a million things I am forgetting. 

And:

Movies where a brooding, even sulky guy seems like really quite a good idea for a boyfriend: