After your D in 12/05, how often did you see your XW? How did she notice you had changed if you no longer lived together and were dating other people?
Having a D10 we saw each other at least 3 times a week. I watch my D after school 3 days. One of her complaints was I didn't spend enough time with my family and wasn't an involved father. I was guilty of all that. She noticed me making my D a priority in my life, I never missed a school function, went on vacations and did fun father-daughter stuff on my weekends.
What I think happens is when the fog lifts they see things weren't as bad as they thought. My exW admitted to me last month that the "grass is not greener"
She also saw me being financially responsible with her, meaning her alomony/CS payment was always on time. If I owed her money for a school activity or clothes, I never argued and paid her the money.
Loving uncondtionally is for YOU , expect nothing in return. It is very rewarding when you learn how to do this.
I know how hard it is when they do not reciprocate nice gestures. Remember the big guy upstairs sees it and that is all the counts.