M.A.
J., I too am a single mom & my daughter is with her dad tonight too. It is his turn to have her on Halloween. I'm not sure what your arrangement is but we switch off every year. If he gets her Thanksgiving then I get her Christmas & every other year for Easter & so on. This is part of divorced life. What does your custody arrangement say? Was this his year to have her? I am currently going to counseling to learn how to deal with my very difficult ex. What my counselor told me was that I need to forgive him. Not because he is worthy of forgiveness, but because I am worthy to be free of the pain he has caused me. A light when on the day that I was given that advice. I now try to respond instead of reacting to his very antagonistic statements. I suggest the book "Boundaries", you can get it on Amazon or just about any bookstore. It has helped me tremendously with dealing with him. Hang in there. As far as your daughter being smitten with the new girlfriend, just remember this, YOU are her mother, and YOU are the one that is there for her when she is sick, sad, & bruised. There is a special bond between a little girl & her mother like no other. Make sure you do special things together just the 2 of you & tell her how much you enjoy being her Mommy & watch her eyes light up. Be secure in your relationship with her & don't let her know that it bothers you regarding the girlfriend. I have come to the conclusion that there won't be many easy times when it comes to dealing with my ex. But I always tell myself that I can do it for my daughters sake because I love her so much. Try to remember that the next time he acts up.
I will pray for peace for you regarding this situation.
God Bless & good luck!