I have an analogy for you from my own life. A friend from my youth who suffered a premature death.
He joined the British Army at sixteen, serving in Iraq and Afghanistan. Fighting for his country was his dream. When he was discharged from the military and returned home for good, he took his own life, because he couldn't survive the peace he had long fought to create.
The man who chose you to make good his desire to marry, likely wasn't equipped for the intended and unintended consequences of marriage. He had a dream, cherry-picked you to realise it, only to run from the practical, lived truths thereafter. He abandoned the visible consequences of his choices, just as my old friend chose to end it all.
Both situations reflect the same psychological paradox: the destructive gap between the struggle to attain a life milestone and the reality of possessing it. Men who confused their desire to fulfill a dream, with the capacity to live in it. Past masters at fighting for the prize, but bereft of the tools to sustain it once the prize is won.
The only difference between your ex-husband and my old friend, is one of them got their dry run all wrong but lived to tell the tale.
For all the anguish his infidelity must have caused you, his spiritual state will have been even worse than your emotional state at its lowest ebb. A man has to be spiritually dead, to have done as he did to you.
Thank you always for your kindness and empathy,
@Kainos.
I am so sorry to hear about your friend! How heartbreaking that he couldn't enjoy the fruit of all his hard-fought labor.

I pray that God will comfort you, his friends, and family over their tragic loss.
As for myself, over the years, God has definitely used my situation to teach me a lot about life, and the things people go through.
Looking back, I honestly can't say a single bad thing about my ex. Part of why I felt so bonded to him is because he had been through so much in his life, but never put the blame on anyone else, and always strived to learn, grow, and work to move forward. I was lost in a sea of depression and not knowing who I was; he, on the other hand, had been made fun of for the same things and had gone through much worse, but he could take those arrows to the heart and thrived, whereas I felt like I was always shrinking.
I clung to him, hoping he could teach me, or I would someone absorb his super powers.
But we were both still very human. I was emotionally unstable, and in the end, for his own mental health, I know he was looking for something, someone, who was on much sturdier ground than me.
I was surely bitter, angry, and blamed most things on his actions for many years. But over time, God pointed out the many wrongs I had committed and to this day, it has become a huge component of my own sorrow. "Oh Lord, if only I could go back and change... If only I could have said or done this or that differently..."
But I can't.
All the things I felt were someone else's fault -- God saw to it in time that I found myself in many similar situations as the people I blamed for my own demise, and to be honest, I'm sure I made much worse decisions. God convicted me heavily of the judgments I had made on others.
I don't know what my ex's spiritual stance is. I have sometimes wondered if I will see him in heaven (I do think there is a fairly good chance.) I often wonder if I will do something, or already have, to mess up my own chances of going to heaven. Yes, I know all the passages about how nothing can separate us from God's love -- except (just my own personal belief,) a conscious choice to walk away and/or follow persistent sins (including unforgiveness, as God cannot forgive us if we do not forgive.)
If it happens to be that he and I both wind up in heaven, I think that's the only way I could ever face him again -- when God has finally wiped away every tear and sorrow, because I know as it stands, I will carry this grief for the rest of my life.
Part of why I've stayed single is because I've never met anyone who can turn take the bad in life and turn it into fuel for achievement as he did. In the years after our split, he continued to thrive, opening a business, publishing books (his lifelong dream,) and having a family (so I heard, and was sent pictures, by someone who found me on Facebook.) I thanked the person who told me and sent all the pictures, but politely said I had to cut ties, then deleted my account.
He continued to thrive, whereas I felt I had just shrunk all the more.
My heart couldn't take knowing any more.
I know we are all different and of course, many have told me to "just get over it," or that it was "a long time ago." I have also gone many, many rounds with some Christians who told me it was no big deal because we didn't have kids and I could just remarry, while many to this day tell me I can never remarry (imagine being told that at 25 years old,) even though he left for a girlfriend (which I didn't find out until about 8 months after he divorced me, so people always told me I had no Biblical reason for divorce.)
The thing I always wonder is, when these people face with their own trial, whenever and in whatever form it comes, is it just as easy for them to get over whatever they have to face as they tell everyone else it should be.