IMHO, he is also reacting to what he is seeing, he is doing some temperature check to see if there is a change or not.
In his mind you are just faking to get him back home. He thinks if you are being sweet is because you want him back the next day, but will then show your real colors.
Don't over react, this is not your goal. Take the time to cry, let that pain out somehow, be careful the kids don't see when you are hurting the most and once you are calmer, then assess the subject.
He is looking for your reaction, he is trying to prove to himself that his decisions are grounded and he is justified to go crazy. Besides the fact that if he is going through some crazy MLC roller coaster it will be a YOYO dance about the same subject over and over.
He is stuck in his pain. You probably exhausted the OW stuff on his face. And believe me, I don't think that it would be natural to just be happy while your XF was in an A. You have all rights to behave the way you did.
But now you know better, you know that this is cheeseless tunnel and does not solve the issues. So, let's learn from the past and move forward.
I like that: "I hadn't thought of it that way". It's something short, does not say much and yet, like NYGal said, it acknowledge what he is saying to you.
This is a 180 for you. In the past you would just blow on his face and charge even further his guilty, now you show him you start listening and understand the real issue.
Just be aware that he won't stop there. He will push your bottoms many times more. One day he will probably show some affection towards you and then he will guilt you again.
And that is why it is so important that you are in a good place and feel a little better about yourself, so you can be strong and resist all his games.
Like yesterday, he did not text you because he is seeing someone different now and it is messing up his mind.
Don't get into any desperation. It may even be something good. You change and he will react. Keep the hard work. It won't change overnight, it will take time.
BE PATIENT...BE PATIENT... BE PATIENT...
Let the dust settle and then you can see the path.