Since it's not over yet, I wish you can overcome this. Don't lose hope, there's always a chance.
My father had cancer, but his biggest mistake was giving up years before he died. I remember him  telling me that we may not see each other again every time I came to visit and so it went for more than 5 years, until he finally got it right.


Death is a concept that reaches far beyond trust, trolling, or anything a person said. You had your differences, but this is like kicking a downed opponent. If this is true and he doesn't make it, no disputes between you two will have meaning anymore.
I often think about death and the only thing I'm afraid is not being to feel anymore. I'm pretty sure OP would rather take shit from you for the rest of his life than die and never feel anything anymore. I doubt he's seeking attention at this point. When you know the end is near you just want people to remember that you were there, you want them to know what happened to you.