My boyfriend said he sometimes doubt he loves me?

Right we have been going out 3 months and the last 2 months we started doing sexual stuff not sex. But it was nearly every time I saw him. Then I went last week do you think it's becoming too sexual and he was like yeah. Wouldn't mind just cuddling you. This week I hadn't seen in for a week and finally got to see him yesterday. I was happy to see him but he wasn't really to see me. He looked bored and left at half nine to see his mate. He's never done that before he usually stays to half ten. And this really upset me because I was really happy to see him, and it was almost like he didn't miss me at all. Then he went and texted me saying sorry for being such a **** just feel bit mer. So I was like I feel crap now. And he was like sorry just got a lot of things to think about. Then I said what things? And he said exams, what I want to do when I'm older, us. Then I froze what about us I said. He said I have mixed emotions. I was like you love me right ? And he texted back. Yes I think so but some times I have mixed emotions, then I doubt myself. I can't believe what I was reading. He was like we need to tone down our relationship with the kissing and that, and I'm not leaving you. I was like okay like when we first started going out. He was like yeah, just all the kisses don't seem to mean anything when they should. I was like we are going to sort this out we can do this cant we ? And he said yeah should be. Then I wanted to phone him and talk about it and he said I'm nearly asleep can I phone you tomorrow. I was like I can't believe this is happening? And he went it'll be fine, night beautiful love you. At the moment I feel like he's going to dump me and that he doesn't love me which has really upset me what do you think ?