Thank her for being honest with you and tell her you understand how she feels. Don't say you'll fix everything, she doesn't want to hear it. Just quietly work on yourself.

And now the important part for you: (I know your history!) Don't ask about the R, the M, or sex, just don't do it! She's made up her mind she's done, asking will only reinforce it and hurt you. NO PRESSURE. The only talk allowed is about D.

Concentrate on caring for you and your D.

M: A really long time.
Crisis: 5 years.
She's still worth it.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl