Mountaindewed, I think there's a difference between forgetting someone, and just moving forward in life in different directions. I thought I'd be terribly devastated when I had to leave my long-time psychiatrist. I probably would have at a different point in life, but I'm OK now. I will never forget him and will be grateful for everything he did to help me. But I am happy with where I am now. I have a new psychiatrist with a new perspective. That seems very good.
The stages of grief pertain to so many things in life, don't they? It need not be just deaths of people we know. It can be changes in life in other respects. Or other types of loss. The process can be hard, but it generally progresses, though at various rates. The only danger is not grieving sufficiently. But who's to say what is and isn't sufficient?