Cant tell if bf wants to have sex or not

My bf and I have been together for almost 10 months (we are both going to be seniors in HS). I honestly can't tell if he wants to have sex or not? We are both virgins but I'm ready to have sex or at least I feel like I am. I have talked to him about it and he said "I guess it just happens when it happens." I agree with what he is saying... whenever we hang out he is always all over me but he never tries to get into my pants. I'm just confused on if he wants to have sex or not. Thoughts and advice please!