I think neglect is a way of checking out emotionally. Sometimes it's just being oblivious to what a R is, sometimes it's passive-aggressive, or it could be laziness/selfishness. Once someone has checked out emotionally, the groundwork is laid for an affair.

Then it's really up to the neglected/cheated on spouse to decide when they give up hope to fix the R.

M 16 yrs, WH62, P54
3 adult blended kids
EA 11/13, BD1 6/14
PA fall 14, BD2 2/15
Piecing 2015, BD3 12/15
Separated 4/16
WH moved OW in 5/16
Divorced 6/15/17