Psychotic (2014)

When Michael becomes Jealous of his roommate Jennifer receiving lots of attention from men and women he convinces Jennifer that her boyfriend is cheating on her and this is when Jennifer starts killing people. This is what Michael always wanted to accomplish. Michael kills people out of Jealousy and the two go on a killing rampage. They both Have split personalities. Michael also travels do to his work in the music industry where he also kills during his travels. Eventually it is discovered that some of the killings are a dream.