I would suggest rereading the infidelity parts DR & DB one more time. I'd then take a long hard look at myself in the mirror and ask myself what role did I play if any, in the A happening in the first place? Then I'd say to myself that If my W loves me enough to have to deal with what she's done perhaps for the rest of her life, and still want the M to work, why can't I find it in my heart to forgive her.
Because in the end, that has to happen for both of you to move on together. If you can't forgive her, then consider saying goodbye, and see how that possibility sets with your heart.
