Catblack as tough as this situation is I think you have a good head one your shoulders.
You mentioned what you need - committment, monogamy, therapy, time to see the changes. This sounds like you have your limit on what you will accept.
It's enforcing what is important to you.
that he'll keep coming over to hang out and have dinner and watch tv together, that we ought to keep sleeping together...
This is what is intermittent reinforcement - or him negotiating and pushing that boundary.
This doesn't have be an ugly thing coming from you (like how you mentioned about being on the same page - but it doesn't mean it won't be difficult. If we all had that luxury when doing what we believe to the be right thing.
If you want to "see"how he responds and pans out to make a furher determination on whether this relationship can move in a better direction then its important to do things differently.
He may flip flop back and forth after moving out between that all or nothing thinking. The proof is in the pudding.
Id be very clear on my expectations, what I will accept and how I will be measurig things. It's up to him on whether he wants to step it up.
But above everything else its obvious he keeps leading and its ends up hurting. So don't let him lead you. He needs to show you he's capable of leading you somewhere you want to go before you jump on his train.