Talking to myself

I have done the same thing. When my mom died I was used to going to taking her to lunch everday. For over a year even two later, I would still have moments where I started to call her to see if she wanted to do lunch, or something would happen and I would start to call her to talk. We were best friends the last few months of her life.
Yes, I feel she is still a part of me, but I still miss her desperately and need my mama.
I know its not quite the same premise as your story, but yours reminded me of mine. Hope you don't mind sharing.