because it is not perceived as sincere or genuine. it's also something that can lead to resentment. one day you'll say "i did this for you and what have you done for me?" tit for tat .. scorekeeping .. resentment.
if you do it for any other reason (other than doing it because YOU want to), it will lead to resentment down the road.
What if I WANT to do it because I value our marriage and I WANT her to be happy, which also meakes me happy.
At this point, I am ready to give up on it completely. I'm just going to do what is right for me and for my kids.
"Time to change has come and gone. It's your decision."