The enormity of what he did, the years of endless lies are harder and harder to ignore - I didn't give it too much thought while in crisis mode, but I'm finding the pain is getting more intense and harder to set aside. And even though things between us are pretty good on the surface, I don't think I can do this much longer.
IMT, You're not the only one with "second thoughts." This has been talked about fairly recently here in piecing, and I can relate. At times I feel those feelings of doubt coming on strong. Sometimes the hurt wants to raise it's ugly head and haunt me. But usually a day or two goes by and I'm better again. Having a H who is truly piecing with me helps.
It takes time to heal, reconcile and move on. Don't expect it to happen in a few weeks. You never forget but you can forgive IF that's what you want. You've come this far, give yourself some time to rebuild. I try to remember that the past is over and done with. You can't change it. But today and tomorrow is are brand new days.
Have you tried counseling? Also, a weekend doing Retrouvaille may help you, too. A few here have completed that program and speak wonders of it.
Have you given any additional thought to what you're going to say to him?