I truly do understand the dissonance, the bewilderment when you find the foundations of your life aren't what you thought they were. I've been through it - more than once. 'Coming to terms with it' doesn't really happen, ime. It's more like understanding that you've built over an active fault line and deciding what to save. That house is going down the hole anyway - it's big fucking shock, all right, and it's the first thing you need to 'come to terms with' because life CANNOT continue as before.
The question is 'What to do?' You seem to be stuck at the stage of wondering if you can believe the truth. Was that metaphorical earth tremor really as bad as it felt, and is there some other reason your metaphorical house has gone all wonky? Can you shore the thing up enough to ignore the cracks?
The answers are: yes, it's that bad; it really is broken; you can try and shore it up but you will always know you're walking over a chasm that could swallow everything at any time.
I'm not trying to tell you what to do. Some people manage to rebuild (a new metaphorical house on different ground) or to hide the damage and carry on, relatively cheerfully, with a heightened sense of impermanence. It doesn't often work, but it can.
What I am advising you is to stop obsessing over what he was feeling and the rest of it. You need to decide whether you want to be married to a man who definitely doesn't love you that much, doesn't respect you enough to share his inner self with you, and who's happy to conduct a deliberate campaign of deception against you.
If, against all odds, you do want to spend your coming decades with such a man, it's time to start working out how to live with your choices. It's also well past time to start getting a clear picture of the life you'll move into should you decide to knock this shitshow on the head and branch out on your own (with the children).