I don't know the whole story, but it sounds to me like you have had a power struggle with this woman for your bf's love and attention. That's what this is all about.

She can't live much longer. She's 92! And if he heart is really getting jump started, she maybe has a few months left...weeks...days?

Now that my mom is 80 i have given her a pass. It's too late to change or even confront. Just let it go and try to find peace. You'll be doing yourself a favor.