Ugh, sorry you're going through this.
I originally thought this might be a case where he believed he was genuinely in love with two people, actively chose you and the marriage, and wasn't able to move on as quickly as he's expected in spite of trying. But it's clearly not that at all.
Saying he only really thinks about her when I get upset and berate him about the affair sounds like gaslighting - he's only wallowing because YOU are being mean and vindictive and angry. If you suddently start being all sweetness and light to him, will he magically "get over it"? It's been months!
Can I have a fabulous life at 60? On my own? Are you having a fabulous life at 60, NOT on your own? Which life do you want in 5 or 10 years?
I agree with LonginesPrime - consider separate counselling. You might even be done talking about the relationship, but want to talk through your hopes and fears about starting over, especially if you're not telling family and friends yet. Also - reading through all your follow-ups - he hasn't just broken your trust, he's smashed it to smithereens, jumped up and down on them, and blamed you for it. I would be surprised if that HASN'T played havoc with your self-confidence!