I lost my wife 3.5 years ago. She was in her late 40's. We knew she was going to die, and it was an awful process. We thought we were prepared. But there's no preparing. When it happens, everything inside just shatters. Even 3.5 years later, I find myself just bawling at times, and I consider myself ahead of the grief 'curve' if there is such a thing.
I've come to the conclusion that I'll never be over my wife. Even if I remarry, there will always be that part of me that's hanging on.
You don't really heal. You just find a new balance without that person in your life. You go through the motions until a sense of normal returns. But there will always be part of you that is shattered, never to be whole again. Thankfully, it's not fatal to the sufferer.