<human>: I've been dating this guy since the end of the summer, everything's been really great, we always have a good time, don't really fight, things are always good. 

Recently he's been acting really distant, and just doesn't seem himself, his actions and words don't seem to line up, and i just don't know if I'm over analyzing it. 

I've invited him casually to family get-togethers, but he's been busy, so he's unable to attend, therefore has only met my Dad and one sister. Well he brought up the fact that "any other girl he's been with for more than 3 months he's gotten close to her parents" and then said "But I don't want to intrude". 
I've invited him to these things, so not sure how to take that. 

He mentioned that me spending his birthday with him was a big step for both of us,and he liked that. But since then has been really distant. Normally he's really cuddly at night, but he's just been rolling away from me and seems tense when I try to get close. 

I know I'm over thinking a little, but I know I either need to back off a little, or find a better way to show that I do care. but I just don't want to smother. 

I know this was a really long ramble but I don't really know what to do anymore. 
I really really care about this guy, and I don't want to screw anything up like I tend to do in the past.

Condense the text into a few key points
<bot>: Dating a guy for a while now, things are great, but he's been really distant lately, not sure if i need to back off, or try to get closer.