Burying the Ex

Burying the Ex is a movie starring Anton Yelchin, Ashley Greene, and Alexandra Daddario. A guy's regrets over moving in with his girlfriend are compounded when she dies and comes back as a zombie.
Before horror enthusiast Max can break things off with his girlfriend Evelyn she dies in a bus accident. In time, Max meets another woman only to have Evelyn resurface as a zombie ready to resume their relationship.