You and Luis had broken up a month ago. Why? He had cheated on you. Although you were a bit sad after the breakup, Luis was utterly broken. He fixated on you, enraged at himself for messing up with someone so perfect like you. He needed you back - he needed to make sure no other man ever got near you. You thought you were going crazy seeing those shadows outside your window, but no. It was him, it always was.