I am wondering whether you really WANT this wound to heal. I can't help noticing that you're only here after he hadn't responded to the three e-mails you sent. If you'd gotten a response, you'd be fully content to be sucked right back into things. It's like a drug addict who's lamenting about how they want to break their addiction just because they weren't able to get their fix that day. It's hard to believe that the moment somebody offers them the drug again, they won't happily take it.
If you're really serious about moving on, then you need to just do it. Stop making excuses. It's likely he's moved on and won't be as hurt as you think. And if he is? That's pretty meaningless at this point. You've been stuck in the relationship for two years already! What makes you so sure it won't continue for several more? That should be a lot more worrisome to you than how he's going to feel. Especially given how badly he's hurt you. You need to start doing what's best for yourself.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy