To ex-spouses and custodial parents, how many of you give "leeway' to the other?

i have always taken my ex husbands feelings into consideration but i feel as though he never returns the favor! i don't want my son to suffer because his father is a pr***. i gave up trying my best a few months ago & started playing him at his own game, he soon realized that he was acting totally irresponsible and needed to put his son first and stop acting like the 40 year old spolit brat that he actually is!