too overprotective/ jealous?

so my be and I have been dating for a year and he just talks to girls all the time, in person not like texting. I mean I get that he's super friendly but he kinda flirts with them too and he ignores me sometimes and it makes me mad. he also asks them for homework answers all the time and he never asks me and I always have my homework done in class so I don't get why he can't just ask me.. and everytime I bring up how it bothers me that he talks to girls al the time he says he doesn't like them like and and I'm the only girl he wants and all that stuff and I trust him I just don't trust these bitches at our school, trying to steal my man. you never know. so am I overreacting about all of this??