I had a similar situation, my W is very needy in terms of affection and expected the butterflies in her tummy to continue forever.
When our M evolved into a stable R, I felt far deeper connected to her. She could never make the switch.
I believe part of the reason she's currently WW is because she was missing the butterflies (combined with all the other factors).
Truthbuster.
Married 4.5, Together 6 M: 36, W: 33, no kids Separation date: 7/8/2017 Bomb dropped: 8/18/2017 Last communication: 1/8/2018 - now nothing OM confirmed - now ended (?)
