I wish it would be easier for him to talk about how he hurt you too, but I'm afraid that conversation won't come from him for a long, long while. In fact, it may never come at all.
He may do things to say how sorry he was, but never really "tell" you about his guilt. That may be how he chooses to deal w/it.
You'll need to decide when the time comes if what he is able to do is enough for you. For now, you'll just need to find a way to deal w/the ghosts of the past two years and see if you can learn to co-exist w/them enough to where you can eventually ignore their existence.
I wish you luck w/that one b/c I know how hard it would be for me and I'm sure the others who have dealt w/it are saying similar things.
It will be natural for you to be a bit unsure of him for quite a while and it is ultimately up to him to prove to you that he's back and back for good.
Keep moving forward, but try to temper your expectations of him. Allow everything he does to be a wonderful, unexpected surprise during this time period. It is a lot to ask, but I know you can do it b/c you know how much benefit the end result will be.
You've struggled through two years and now that he's back, the struggle will be even tougher, but in a much different way.
