We can speculate all we want to, but nobody can give you the answer you're looking for. What the situation seems to be is he's trying to figure himself out, but also not wanting to string you along in the process. Why? It could mean many things, but that's something a conversation between the two of you would resolve.

Letting go is hard, moving on is harder, but always try to keep in mind what is healthy for you in the long run. Brief moments of gratification and comfort could lead to devastating outcomes where you are forced to exercise one option rather than choose between a few willingly.

You're in control right now and that's an amazing thing. Whatever is keeping your mind on him and what could be is really based on what was. The sad truth is that's no longer the case, and, possibly, will never be remotely close to the idea.

If I could suggest anything, have a conversation for closure, not to mend things. That seems like a healthy conversation to have.