What is the name of this movie?

what is the name of this movie a guy and girl I think BF or newlyweds or something well anyways the guy tool his girl to a deserted remote island for a so called place away honeymoon. But he eventually has her were he wants her and plans on holding her captive there as a prisoner of his own then plans on deserting her there later to die. she catches on to his plan and sneaks off with the boat when he was asleep or something that he try to disable before she does not get far etc