You're going crazy for something as simple as this? Don't overreact.
It's pretty simple to understand if you try, I know a friend who had a girlfriend like you, let's do this together...let's do that
together...you might not be that type or girl but from what I've read but I have a 'SLIGHT' impression about it, anyway, my friend tried to get some space for himself but the girl kept attaching herself whenever she could, and today well, he broke up with her, she's still crazy about him, and he hates her.
This happens when the guy starts getting bored, this could be a likely senario...talk to him, and see what he says, AND PULL AWAY EVEN THOUGHT IT MIGHT HURT.