It sounds as though the biggest theme in your life with Bill was love and kindness, Bettyanne. That's such a beautiful thing to say at the end of a life. I'm glad you had him and learned together what was real and unreal about your pasts. What a bond!
I hope that closeness and love will always lead your memories as you visit them.
One day, I hope you will be able to take back your mind from your Nmother and no longer allow her the space. Once you release her to the universe and find new things to think about, you will release your own peace and contentment. You've already come a long way with that--it sounds as though the edge is grinding off the bitterness. That's real progress!
It's hard to believe in the middle of grief time, but you have happy moments and possibilities for peace and meaning ahead. All options for inner peace are ahead of us all, as long as there is life.
If you like to read, I think you would find Man's Search for Meaning by Viktor Frankl very helpful.
Hugs and comfort,
Hops