Is my gut feeling right?

Ok so I have this feeling something is up with the guy I'm seeing... I just don't want to bring it up if its nothing and I've tried asking him indirectly and got nothing! We've not been seeing each other long, about two months, but we see each other about 3 or 4 times a week. He is still doing all the right things this week he's just seemed a bit off... like it was my birthday and he took me out for an amazing meal and drinks for my birthday and came over to meet my friends for the first time today (he was two hours late and obviously didn't really want to but I just said they wanted to and it would be nice if he could, didn't push him into it at all). So as I say... he's doing all the right things action wise. But he's just been a bit weird at communicating... he keeps reading my messages and not replying until later, just normal stuff, which he doesn't usually do. And in general he's not really his usual happy self joking around when he's not with me. He said when we first got together sleeping over at each others was a massive deal to him so he wasn't ready for that, I thought by this point we would have done (he said a few weeks ago he wanted to go out the night before my birthday and then spend all morning and afternoon in bed together, I just assumed we'd be staying the night in betwen), but he didn't. And when I said to him would it be soon he said he wasn't sleeping well as he was worried about an exam (the results are in two weeks) but after the results he'd be fine. I'm not worried about anything outside our relationship, he's very honest with me about his friendships and nights out etc, but I just wonder if all this can just be because of exam stress? And if it is... why doesn't he just say when it's clear I've picked up that things aren't quite right with him? I'd feel so much better if I knew it was nothing to do with me!!

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