Finding peace in oneself makes us whole. We can't successfully live with another if we can't live by ourselves. We can't successfully love another if we can't love ourselves. The point isn't whether D is right its that you'll be happy, healthy and strong no matter which path your marriage ultimately follows.
I've seen this list many times here on this board, but I especially like, and agree with, this part.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.
