I'm trying to be friends with a guy I briefly dated who likely still likes me
What makes you think you can be "just friends"
He seems nice enough and like he would get the point the second I told him that, but I'm pretty sure he still wants more out of it.
It's nice that you think that highly of him and want to still be friends but if you're going to just wait until he makes a move to shut ihm down then you may as well be actively leading him on and you know that's wrong. Tell him upfront that this is a friendship so he knows what to expect.
I really need him to make a move. It's not fair that he gets to just stand there waiting for me to make the move.
You should not be waiting for him to make the move if you are not interested.   I would reevaluate what you are getting about staying friends with him.