Why is having guy friends wrong?

Alright, I have a boyfriend who I have been with for over 2 years now. I’m 16 and I have a few male friends who are 2 years younger then me. They are really good friends, but the problem is my boyfriend thinks it’s a huge issue? I think he just might be jealous or something I don’t exactly know, I tried talking to him but he just doesn’t want me to be friends with them. All because their boys. But the thing is, I get along with guys more than what I do with girls, my boyfriend knows me from in, out. He knows I don’t go for younger guys, and there is no way in hell I am attracted to them. Just friends! I think it’s because he’s affraid to lose me. but he’s loosing me now! My friends want to meet him aswell, get to know my boyfriend but he insists in not to. My boyfriend is 18 by the way. It’s not fair I’m not aloud to have friends. It’s the same with girls aswell. please help! I love my boyfriend so much I just want him to be happy, and trust me. But if me having no friends keeps him happy then I guess it has to be :’( advice would be much appreciated!