[Loser]

Or even better the "obtain password to stalk ex-girlfriend and orchestrate awkward confrontations while she is out with, of all things, other men". That one sounds real promising. I see a thriller or two coming out with that for the plot.

She leaves him because he's creepy.

She goes to the beach, he's there.

She goes to a concert, he's there.

She goes to secluded location with her new boyfriend, he's there and kills the new beau.

She goes to the police, he heads her off and tries to kill her.

She kills him.

The End.