Um, I'm a little confused

I don't know if I'm just being hypersensitive or something, but it seems like this particular Cancer friend that I have (the one I've not shut up about) is being a little distant, on purpose, out of nowhere, all of a sudden...he'll talk about basic work/life stuff, but I've noticed that he'll say "I've been going out a lot and loving life", stuff like that, but he won't specifically say what that means, and I'm not going to ask him. It's just weird, the way he'll talk about some things, but I swear I can sense that he's purposely not telling me about other things, and I don't know why he wouldn't. It's not like I'm going to be mad at him or something if he's hooking up with women, hello he lives a million miles away, I know it'll happen (as I will eventually probably do the same with others here). It's bugging me that his emails are half the length (at best) that mine are, so I've decided to only send him short little emails back from now on (I just did, a few minutes ago). I don't know what's up here...it could just be him, being a non-talkative guy, or I could be paranoid, but I'm confused, and getting a teensy bit irritated. He's not being any less nice to me than he's always been, but he's not saying things, I can tell. And therefore I'm not going to say things. And if we keep going on like this we're never going to say anything, ever.........I would like nothing more than to just be like, "hey, I have some questions, why are your emails four paragraphs at the most and relate to nothing about your personal life anymore" but I'm not going to do that; I don't want him to know it bothers me. F-king Hell....I don't know what I should do. Any thoughts, anyone?

I think when I wrote that, I was just being too sensitive or something, so never mind - I would still be interested in anyone's thoughts, though. I thought about everything and I think he's just preoccupied with a lot of stuff that's going on right now, plus he has to email me from work so he doesn't really have time to write longer emails, plus he's always kind of done that weird guy thing where he forgets to respond at all to about 25% of what I say. lol. I shouldn't be mad at him.