Hey, I know I'm just a stranger on the internet, but I'm real sorry

. I like the idea of keeping happy memories with you. You've been friends with him for a looong time waiting for a real relationship. That's a long time to wait

.
Him sharing e-mails with his wife reminds me of what married couples do. They tend to share almost everything, even private e-mails
I'm glad you stopped talking to him until he gets a divorce.
You seem like really nice person who just needs some help. I don't really know what to say. But if he hasn't divorced by now, even though he knew you wanted him to, then I don't see what motivation will suddenly make him do it. It seems it might not be a big deal to him if it hasn't happened yet.
Does his wife consider your relationship with him romantic or possibly romantic? Does she support your relationship with him? I hope he isn't using you to rub in her face, but I hope I'm not giving you false worries.
Maybe you'll move on and find a nice guy. If you just wanted a good friend, maybe you could find a good female or male friend in the meantime while waiting for him? You never know what might happen.
Either way, I'm rooting for you. Take care.