[quote Brightonpierrot]@Nightbringer do you mean they have been in touch over the 2 years since the affair and she wants me to know? So they can be together? Why is he trying to stay married to me if thats the case?[/quote]
Often affair partners don't see eye to eye.
I suspect they have been in touch and having or heading towards a new affair. They may not have been in touch for the 2 years. But I am guessing they have been in touch with each other over recent months. Did you say, he deleted it and then reinstalled it? I would guess around then.
She either wants him to leave or to just cause some trouble and wanted you to know. So kept liking until you saw it.
He called her to tell her to stop, because he knew you would see it eventually.
Why else did he not block her? He wanted her on his Instagram for a reason. If he blocked her, she can't message him. I can't get passed him refusing to block her, there's definitely a reason he didn't.
He may not want to end his marriage. Doesn't mean he wants to stop his contact with her.
This is obviously, only my educated guess. But cheaters rarely give the full story the first, second or third time. You often never get the full truth
He is slowly giving you more and more information. Hoping that at some point soon you accept it as the whole truth and carry on the marriage. And he can continue as is.