Just so tired

I am in a rough place right now; have been for a while.
On the one hand, I am excellent. Love my job, my family, my freedom, my friends.
On the other? I want to be in a selfish place.  All I want is a little time for me. With NO responsibilities...you know, like so many of our exes out there. I am tired. Does anyone else get this way? My ex can try to tell the kids he is hurting, but he chose this. He chose to cheat. He chose to lie to everyone. He chose to replace everyone by bringing in the new GF. His kids don't really want to have anything to do with him because of all of this. Poor baby, he has to work (so do I) he has responsibilities (so do I)...all he has to do is take our one daughter back and forth to school...and pay child support. I am the one that does the cooking for her, get her lunches made, let her vent to me, get her to all school and outside school activities....while he pretty much gets to do what he wants. I'm tired. When is my "me"time?