Positive advice please

So, just over a year ago, my husband came in from work one day, broke down, and told me he had been unfaithful before we got married. We had only been married for 2 months at the time and had not long been through a miscarriage (planned pregnancy). In the year previous to this, he was a mess. He was struggling to deal with past grief, smoking weed daily, and was underperforming at work (high pressure job). He had also maxed out a couple of credit cards, was missing payments, and had one of those stupidly high interest loans. He didn't talk to anyone about what he was going through and said he didn't want to worry me (I'm a pretty anxious person). I think getting married and going through the miscarriage triggered something in him that made him realise how much he had to lose, and couldn't take feeling the guilt of what he done, so he decided to come clean and tell me he had cheated. If I had caught him or had found out through someone else, he wouldn't have gotten the second chance, but I thought he must be remorseful since he risked me leaving him by telling me about it. He said that the sex had no emotional attachment or physical attraction and that he had no intentions of continuing contact with her. He said it was just to escape what was going on in his head (I get that I can only take his word on this). After a very long night of talking, I told him he had made the biggest mistake of his life and that he would need to change his life if he wanted to keep his marriage. Throughout the last year he has gone through therapy to help him deal with processing and talking about his emotions, is making really good progress at work, quit smoking cold turkey and we've sorted out the money problems. He always took full liability for what he had done and acknowledged that he needed to change to save his marriage. One of my reasons I chose not to leave was the history we have. We click so well and make each other laugh every day. There wasn't a lack of love between us, and we didn't have any serious problems in our relationship. I think he had a lot of stress and couldn't deal with it, so he made the terrible decision to cheat. He knew he was the one who needed to change and acknowledged that everything was his fault. I can see that he's changed, and the effort he's putting in at work is extreme by going in 2 hours early every day to do unpaid overtime (by choice, he's not being asked to do it). What I need help with is that I'm finding it hard to move past the cheating. The thought of him having sex with someone else puts me in a negative place and is not doing anything good for my mood. I don't have anyone to talk to about it as I chose not to tell my family and friends as I know their immediate response would be them telling me to leave him (which is totally valid). Before this happened, I had always said I would leave without a thought if he cheated, but actually experiencing it had made me feel like it's not that black and white, it's like a grey area. I'm just looking for any positive stories really. Has anyone else gone through similar and been able to move on?