Wanting an open sex life

Cole
I've been with my man for five months. He's not ready to have sex and I'm a okay with that! But a lot of girls flirt with me at school, and he has one friend I've told he can blow, fuck or otherwise as long as he tells me so. I also told him I want to have a three some with him and said friend. 
There's a girl at my school I find very attractive and I want to get to know her. I'm also very sexually needy... I don't know how to talk to him about this because I'm worried he'll think he's not enough for me. 
But he is.. I don't need another person to love, I'm just sexually needy.