It is a certification of good time and observation of a person IN THE PAST not a certification of love and/or recognition to the future.
It is nice that one ensure the other one " you will be 幸福" but the decision of leaving makes this statement empty. ---- "You will be 幸福 but I don't think I will have anything to do with it."
Everyone is a kid.
Some are too busy to show that.
Some are too lazy to hide that.