This is a big one, probably the most difficult step you will take when dealing with negative emotions during the divorce process. Letting go of what you want entails changing your own mind about such an issue as whether or not your marriage remains intact. You will be called on, during the divorce process to let go of time with your children, marital assets and much more.
We can want something so desperately that it can feel like an actual need. It is easy to confuse our wants with our needs, especially during the demise of a marriage. You are going to be called on to negotiate and compromise on the issues above. If you can't let go of what you want (need) you won't be able to focus on what is in your best interest during divorce settlement negotiations.
A mother who has been left for another woman may cringe at the thought of giving up time with her children to a cheating husband. She will fight tooth and nail to keep him from gaining shared custody or even liberal visitation.
In her mind, her children are better off with her than a cheating scoundrel. She wants her children and dismisses the idea that even though he cheated on her, this father loves and wants his children also. This mother will put what she wants above what her children want...time with their father and that is when standing up for what you want does harm to not only you but others.
Think of it this way, we don't often get what we want but if we give up the struggle, we can get something better. You may still want your marriage but if you don't give up the struggle to get what you want, you will never know what else life has to offer in it's place.
You may resent paying child support and wish to retain that money for yourself but which is more important, getting what you want or showing your children their needs are important to you, important enough that you are willing to give up a want so they can have?
You are going to sit down with divorce lawyers or mediators and come to an agreement with your spouse about how life will be dealt with once the divorce is final. Coming to an agreement that benefits all concerned isn't going to happen if you are not able to let go of some of what you "want."