sweetheart, you are/were struggling to process because your gut was probably telling you there was more to process than you were privy to.
This is really true. And you will want to reprocess everything to try to make some sense of it. But i'm not sure there is any to make; in a year, five years, ten years, there will be yet another retelling of history. It's all about them. All of it.
One tear met another tear floating down the river.
"I am the tear of the woman who lost her lover," said the first tear.
"And I am the tear of the woman who found him," said the second.
Once you truly accept who he really is, not who you wanted him to be, you will see that you really are better off. One thing that has helped me is to try to see your future in, say, 5 years if he had stayed - with all the lying, etc. That's what you'd be looking at, not the glory of those first days. It was never going to be what you wanted it to be, because he wasn't who you thought you were married to.
Sorry though, it is just awful. 