Why does my so called boyfriend act like this?

there is this hoe at my school and she hugs all the boys and really flirts with all of them at one time. so every morning, we have to sit in the gym and wait for our teachers to come and tell us to go to our cles. my so called boyfriend hugged her and i already told him that i dont really want him and her to hug eachother all the time cuz everytime i turn around, shes all on him. he said thats his friend so i said alright im not worryin about it. so yesterday, he came and sat by me and she came up and gave him a hug and he started walkin wit her and they started talkin. and he just left me sittin there. later on that day, just to get on his nerves, i made a puppy dog face at him that whole day and he said whats wrong wit me and i said you hugged her and talked to her but all you did to me was say hi. then he got the nerve to ask me if i was jealous. was he tellin the truth or was i bein a girlfriend and tryin to talk to him about it. we will be goin together for a year in november. our break ups dont count cuz we broke up over the weekend and got back together on a monday and broke up sometime 2 weeks ago and got together a day after that.