Well another twist in the road - he said he was going NC with OW but then hasn't blocked her number or anything so as soon as she text him he's rang her... he's also said he doesn't want to delete her number as its only temporary so he's clearly no intention of it being long term and it was just to pacify me I think.
What did you expect? He said he needed time...when you decided he'd had enough time, you applied pressure. He's not ready, so he did what he needed to to keep you where he wanted.
A while back you said you wanted it to be HIS choice....did you let him make that choice?
When you let him slide back into your bed, did you attach some expectations to that?
His timeline is not going to be the same as yours. He's not going to do it the way you want him to. You can't control him. But, you have complete control of you. If you decide you need to be NC with your H while he's involved with OW, then you do that. You don't have to tell him anything...you've told him plenty. Just take the action and protect yourself.
If you keep letting him slide in and out, he will continue to do so....again, they all make excuses to NOT kill the A completely. They want that door ever so slightly open. It's a safety net.