This is really painful, Cinnamon Stick. I'm so sorry for your loss.
I think a positive ending is possible, but don't try to force it. Let yourself be angry as long as you need to.

I had a positive ending before this T, several years ago, and we still keep in touch. It's slowed down, but we connect once a year or so. It was difficult, but not traumatic like a sudden ending I suppose. The end was heartfelt; sentimental.

And I learned--with a good relationship, the connection lives forever.