Rainbow,
I'm glad you had a productive session about grieving. What your t said was wise. I had not thought about grieving for not feeling grief as being a form of grief. But yes, the more I think about it, it most certainly IS a form of grief. Makes so much sense now.
In fact, the more I think about it, the more that in some ways it seems like a deeper form of grief. When you are very close to someone, you grieve because you lost that deep connection. But when you lose someone and don't feel grief, you realize that all of those needs for connection and a mutually loving, reciprocal relationship never came to fruition.
Don't judge yourself for what you feel or don't feel. Just let what your t told you rest with you. You'll grieve in your own way, and in your own time.