my boy friend doesnt trust me.what should i do?

okay so ive been with him for about 6 months now and he doesnt trust me very much.I have a couple guy friends and we dont call or text one another at all.the only time we talk is at school and it's not even like we talk all day long either.my boyfriend get's mad if he see's them talking to me or sitting by me or anything he's usually threatening them to stay away from me and stuff.Daylan has a friend that is a girl and they text non-stop everyday and she works out at the gym 4 times a week and thats where daylan works.I dont nag him about it cause i do trust him and i want him to have a life and be able to be friends with whom ever he wants.i just dont know what to do about his trust issue with me.