Woman lost overboard with twist ending

Movie about a couple with relationship problems. Set out on cruise with their cat. Woman disappears overboard during the night. Man searches for her when he wakes and eventually finds her floating on a mattress he earlier tossed overboard. He dives in to retrieve her only to have the boat sail away. They both drown.

See on TV in color. At least ten years ago. In English

Got something to say?