does he like me or does he just flirt

ok so there is this guy named jack and my friend is related to him.. she says that he flirts ALOT yeah very true.i have a boyfriend but i like jack more were pretty close.. he has told my friend that im hot.. hell he even told me that i should be a model cuz i was really skinny and he tells me that i have abs.. i really do like his which is really bad cuz i do have a boyfriend.. on the way back from a soccer camp we flirted alot.. but the thing is he flirts alot so he cant stay in a relationship