I think this whole "flame" mentality is pretty widespread. It explains how some people can suddenly change. It all boils down to them not "feeling" the MR any more, and that's where they feel justified in throwing in the towel.
My STBXW was big into romance novels. I wonder how much of a role that played in her seeing love as a feeling.
Me-47,XW-43 S13,S16 M:18 BD:4-23-17 W filed:7-17-17 (5 months of in-house separation hell) W moved out:1-6-18 D granted:2-15-18 Decree signed:3-29-18