I have signposted you to surviving infidelity and I will do that again. I’m really not sure from reading the responses on here that you will get anywhere near the support and empathy you need right now.
Surviving infidelity is NOT a reconciliation site it is a site for supporting a betrayed partner through the 2-5 years of trauma from cheating. There are numerous forums one being the reconciliation forum but there is also divorce and separation.
You are being absolutely crushed on here for a visceral reaction when you were traumatised. Your writing style did not help your position but the trauma after 40 years would have meant you moving into fight, flight or freeze and behaving uncharacteristically goes hand in hand with that.
Here are my thoughts.
Firstly yes you can survive affairs but not with a cheating partner who is only part way there. I do not know your husband at all, but you need to spend a huge amount of time really unpicking what remorse looks like. This is where a decent affair recovery site will help. I believe @FairyMaclary offered some ideas. I’d also get a copy of ‘how to help my spouse heal from my affair’ and read it so you have a sense of what to look for and then pass it to him.
I’m not sure he has really unpicked why he did this. Two things concern me. One that you pin so much blame on the other woman, there will ALWAYS be people willing to cross the boundary of partnership or marriage in pursuit of their happiness, it is on the one partnered to keep their spouse safe. HE DID NOT DO THAT. You keep mentioning that he wanted to experience sex with someone else, underneath that is a deep rooted selfishness and entitlement that his needs trumped your mental, emotional and sexual health. That is something he needs to dig deep into otherwise he remains unsafe.
You need to really spend time reading around affair psychology. Again @FairyMaclary mentioned a number of sources. In my honest opinion all sources have their worth. I read prolifically to understand myself and my reasons for staying and to understand my husbands actions and to help my healing. On mumsnet threads there are a lot of blanket statements around reconciliation and ‘love’ but it’s not the TRUTH of many happily reconciled couples or reflective of their lives and day to day experiences.
In the same way as people are bleating on about other women being different, every cheat is different, every betrayed is different and every story IS different.
The trick is to navigate YOUR story as safely as possible while healing from one of the worst of not THE worst trauma of your life. I found knowledge is power in doing that. As is talking to people who have walked the path you wish to take. SI will help with that.
Im sending you a unmumsnetty hug, I’m in awe that you keep reaching out here despite the messaging you’re getting.