PIE

First thing to do is breathe.
Quick, Quick, Quick doesn't work here.

Patience, Patience, Patience is the name of the game.

From what I quickly read your husband is cake eating.
If he has an OW he is not ready to have a R with YOU.

You must detach, not let him cake eat.
From your part, you can not have a R with him if he is in a R with someone else.
That is a boundary!
That is something you CAN control.
Because you can control YOU!

Of course he wants you to think that he still wants you.
He is confused. He is in MLC.

Have you read all of Cadet's links that you were given at the begining?
Even if you have I would go back and read them again.