Only after reading this post have I seen the past five years of my life with this much clarity.
"Give them hope. Bad relationships run on hope, on the possibility that it can change, that you can change. The second you sense that you're losing them and they're giving up on the relationship, bring them back in with a sweet gesture. They can live off that gesture for as long as six months. They can live off the hope that it'll all get better for a long time."