"I feel crap that I cared about someone who can treat me like this.".
See, I don't get that? Treat you like what?
He's a married man fgs.
He's married to someone else. It isn't treating you badly to drag out a desperate should we shouldn't we, if only if only hang wringing semi affair.
He has chosen his wife.
You say you have chosen your husband.
Well then you really really do need to just get on with it.
You say you will never send another message. Then the next day you email him. Then you get the hump he doesn't email you back.
It isn't rude of him or treating you badly. It's sticking to his wife, his vows, his common sense and his dignity.
It might well hurt a lot. I'm sure it does. But you cannot go on and on and on about what might have been. Do not delude yourself that there was no way he could have tracked you down if he had wanted to. You both had many chances, you've said so. It didn't happen.
You really need to decide once and for all if you want to be married to your husband or not. That alone is your decision. If you decide you do, then you must delete all numbers and email addresses and any other method of contact, you must not contact again and you need to actively push any stray thoughts of him away, rather than passively saying you can't help it. You can help it. I find it unbelievable that you and other people are angry with him for not indulging in this. How many people want their husbands to cheat on them? Because he surely understands that any contact with you would be a bad thing for his marriage. It just would.