Maybe he is just confused, is all.

You've been more open to being sexual with him (the shower scene) and perhaps he thought you wanted more of everything.

It's a delicate balance, for sure.

The HD person has a tendency to smother, and the LD person has a tendency to distance.

Is he like my H and needs concrete amounts to know how much is too much?
Cause he can't read your mind and trying to go off body language is impossible. Perhaps you could use some positive reinforcement when you see him trying to give you your space? "Honey, thanks for giving me some space this afternoon..now come here and let me give you a hug!" etc. That would be a way to let him know when he is doing it right and give him something to build off of.