We seem to be in similiar situations, in that, We have been married a similiar amount of time, and both have young children.
I feel for you man. I wouldn't wish this upon my worst enemy.
I'm currently in the same stage as you, W wants (is basically separated) her space. I'm doing my best to detach, and GAL, and have also been noticing that my w is slightly pursuing.
Some advice from Accuray. He said to KNOW that this kind of behavior will happen. To expect it, and know how to face it. I know this isn't easy to deal with, but you have to put a face on. You have to pretend that everything is ok. (cry later... in the car if you must, that's what I had to do this morning)