Grr, if it is love, I don't think it does die. I think it is suppressed, denied, turned inside out, attempts to find a replacement or distractions. In my case, I think it really aggravates my wife so it is expressed as anger.
I believe that most of the cases here, the wayward spouse doesn't feel deserving of love. Some don't feel comfortable being loved.
Me:56, W:51 D:26,S:24,S:22 Married:18 Bomb 9/27/06 Separated 11/27/06 Divorced 10/6/08 Leaving it up to God