should I tell him that I am just as unsure about things as he is?
Well, we don't really know just how unsure he is. You'll probably be the last one to know. I think you're non-responses of "OK" and "Alright. I'll talk to you later" to his "ILYs" is right on target. Maybe not return a couple of calls of his again.
Are you guys still in the same house together? I get the impression you're not. I'd start thinking of ways you can subtly, very subtly, not directly!, hint at or encourage having him be part of your home life while you stay detached and cool, allowing him to bring himself closer. For example, you might ask him, "What are you doing for dinner?" (I can already hear H saying, "Why? Do you want me to come for dinner?" and you saying, "If you like") and it could be that if you just subtly encourage things like that to happen, but keep back, he'll take the initiative to slowly move back in to the relationship like a cautious street cat coming to feed out of your hand. Maybe. But you know if he does, you've got to both work hard at getting rid of whatever it was that was problematic in the relationship!
