I dont get why i even like this guy...EASY 10POINTS.?

so i like this guy. and im guessing he likes me too because we have hooked up before. as a matter of fact we hoked up about an hour ago.. no ... he kinda tried going in me.. a i guess. and i sucked him..i dont understand why i like him. he HAS a girlfriend..and he keeps telling me he feels bad and isn't gonna hook up with me.. but does.. whys he so hot and cold? im better then his girl and he knows it.. but hes still with her..well he says im prettier then her..and i do talk to him about his problems.. i help him alot.. i dont know why or when he will see this....someone who's been through this.. tell me whats gonna happen next.. please..im very desperate..whats going on in his head...