Second issue is I am so angry at him that I can't and don't want to make eye contact with him. He got upset about that today and can't understand why I can't be a mature adult about it and co-parent with him. He wants me to be his friend and I just don't have it in me. Am I wrong? Am I being immature? It feels like I am losing a family member despite all of our arguments and his insensitivity towards me. I need time to process it all. Am I wrong? Do I need to be his friend? He is a good person just one that didn't love me.
Sounds like you are not DETACHED at all.
My suggestion is go back to the beginning and start with a beginners mind.
You have to look deep inside yourself to get some of these answers, they won't be easy and LETTING GO is very hard.