Hi, troubledway, I am a WS and your story sounds very similar to my own, so I will respond from that perspective and also from a few years out, although I am still sorting my life out in many ways.
I think in the mix of responses you received some good advice. BTW, you can put a "stop sign" on this thread if you rather not receive responses from BS's. For me, their input can be valuable, you just need to look past their pain.
In particular, solus sto gave you excellent advice:
If you want to divorce, the best thing to do is to exit the marriage gracefully and kindly—with compassion. Make the divorce as peaceful as possible.
Also this, by notperfect5:
So I recommend you divorce him as gently as possible. Get into IC and fix your character flaws, and learn to be a better person. Then, no matter where you go, or who you are with, you will be with a person of integrity and good character. Start with you and dig in to remake a new you. One that doesn't chase romance or fun or happiness, because it is like chasing the wind.
You can do this. You can be a great person and you can get off the "troubled way" and step out into the light and be a new great you. Maybe then you can reach out to your ex-husband and give it a new go.
A little about my own situation...
I had an "exit affair." I was married 23 years to my high school sweetheart, five kids; three still at home at the time. We fought constantly. Things escalated one night after a friend's birthday celebration and when we came home, we picked up where we left off with a previous disagreement. Fueled by alcohol, the argument ended in a domestic violence incident.
After that low point, my husband started mandatory IC and I started IC. I proposed an in house separation to my husband. This was advice given to me from an online marriage forum I had joined for advice and support. It was supposed to be a sort of a cooling off period while we worked on ourselves. I distanced myself from unhealthy friendships, gave up alcohol, read my bible, and felt much more peace than I had in a long time. But my husband couldn't handle it and started pressuring me again about our marriage.
We eventually moved into MC. My intent was an amicable split, but I was afraid of confrontation and the DV incident didn't help my confidence. Meanwhile, I met my AP on that marriage support forum and the affair was soon discovered by my husband. MC was halted. I continued to communicate and meet up with my AP who lived on the other side of the country, but I tried to be discreet. When pressed, I would say that I didn't want to work on our marriage.
Unfortunately, my husband lost his job in the middle of all of this and neither of us could afford to move out. Now we were both home all day (I was a SAHM and still home schooled our youngest) and the atmosphere was volatile at best. I avoided him as much as possible. He drank heavily and said the most horrible things to me. We were all afraid of him. I truly felt stuck and the affair was my only escape; the only time I felt happiness.
Like you, I thought there was a way that I could get him to see we would be better off a part from one another. I saw a future where our children still had both parents present in their lives, just not living in the same household. I wanted for us to be friends. I also wanted him to feel the joy that I felt when I was with my AP. I know it sounds weird, but I really wanted him to be happy and to meet someone who would compliment him in life.
My husband eventually did meet someone and he moved out and I moved to a smaller and more affordable place. For the first time in a long time, I felt peace. I had my life back. I had never lived alone before - I literally left my parents home to be with my husband, so this was a period of adjustment for me. The time and space away from my husband and the tense atmosphere allowed me to reflect on the things I could have done differently.
The posters I quoted above were correct in saying that you can't heal your husband, at least not in the way that you think. You are trying to control the situation and it just doesn't work that way. You can, however, conduct yourself in an honest and straightforward manner, even as you stand your ground. Admit to your faults. Agree when you are wrong. Ask to be forgiven. Then, step away, because the rest is really up to him.
In the end, you must deal with the fact that you caused his pain and there isn't anything you can do to take it away. His hurt may dull over time, but the scar of your betrayal will remain. If you think like I did, that you're basically a "good person," then this will be a difficult concept for you.
In my own story, life is much less stressful and my relationship with my now STBXH continues to improve. Divorce papers are filed, waiting on the judge. We often speak on friendly terms, and wish each other well. He's actually buying a new house with his girlfriend. My two youngest boys were just with me and my boyfriend on a week long camping trip to Utah and Arizona.
The place we are at now is the life that I believed could happen and I am so very thankful for the way it turned out. It hurts to look back and see where I caused unnecessary pain in the lives of my family and others, but I've learned to stop trying to control the outcome and to embrace the journey forward. I hope you can figure your situation out too and I wish you all the best.