Holy Crap! Didn't expect THIS!

[Dom R]

Thanks Dom- I bet the stuff you suggest would work on a normal guy/man with cajones.

ha. but hold that thought.

but I stopped him dead in his tracks and said his reasons didn’t matter. It was wrong.

good

...OH! And he said “Once we live together, that sort of thing wouldn’t happen.” WTF?!

...
-I told him it was important to me that he wear his ring. He at first said “I have no problem with that” but when I said I wanted that to happen within the week he said “I’ll wear my ring when you move back in.”

note #1; you were too lenient. you changed my "TODAY", into "by the end of the week".

Your average squirmy-avoidance guy will interpret that as, "she's not serious, so I'll just ignore/bluff her".

So, note #2:
call his bluff.
move back in.
TODAY.
Call him right now, and say, "ok, I'm moving back in with you. I will be sleeping there from now on. Starting tonight.
I expect you to be wearing a wedding ring. TONIGHT"

I'm serious. From here on in, be sleeping there. He has no valid reason to object. Therefore, do not accept any excuse.
It's not like he can claim "there's no room for you". You already have a place to sleep there. In Your Husband's Bed.
(and hey, I suspect you living there, will "assist" in getting those other people out, too. It's a win-win! )

If you want things to truly change in your relationship... then quit "waiting" for it to change, and make the change yourself. Today.

-He doesn’t understand the “rush” for me to move back in (end of April)

I would say, the "rush", is, you're tired of waiting, and you will not wait any longer.

-Me “The rush would be that according to YOU, you won’t exclude me when we live together so I think I should move in this weekend based on that statement.”

Screw the weekend.
Do it tonight.

Either he's serious, or he isnt. He claims to have made his decision. Now hold him to it.

Maybe he's stalling, because he's attempting to "clean some things up". aka cover some things up.
Like last weekend.

Time to throw back the rug and see what's lurking underneath?

Keep in mind that there is a high probability you will uncover something more. So be prepared to be shocked, but also to just keep going,and clean up the mess somehow, and then keep moving forward with your life together.

Some men are inherrently irresponsible.
Here's where I circle back to your first comment that I quoted.

I figure if you wait until he fully grows up, you'll be waiting forever.
If you want to be married to him, I think you will have to take on the responsibility on yourself, of being part of his "conscience", or however you want to put it.
Or to put it in old fashioned terms, "his better half".

You will probably have to be the goad, in some but not all instances, of getting him to do "the right thing", even when he is flakey/irresponsible if left to himself.

This would appear to definately be one of those times.

[edit ps: I think the good news is, he sounds like he has mostly really committed, but is embarrassed/feeling guilty/dragging his heels/whatever. I dont think that is going to go away. Hence my advice above. I figure that you're "close enough" to where you need to be at this point, to just get past the awkward bits now]