Filing for support....?

I think i need a pep talk. I dont know whats holding me back for filing for support for my daughter. Its been a few months since we moved out. The financial support from her father has been 1) not enough 2) inconsistent. I dont understand how someone thinks they can choose how much to financially support their child when I dont have a choice. His first child has an order and receives regular payments, why cant his second child have the same structure? Tax season is coming up, he told me he made certain changes that seems to affect his income (less now). Why now? He doesn't bother to ask me about our daughter's life either unless i volunteer information. I refuse to give him personal emotional support/ attention, i think its inappropriate. Im not obligated anymore (still married) to comfort him about his nightmares or long drives on the road, his choices in life are his and not my problem anymore. No I dont think we can be friends, too much has happened. I just want to share our daughters life with him but he doesnt seem interested in initiating conversations about his daughter or coparenting conversations period.. Ive told him i would always allow video chats phone calls during the week before bedtime because shes in school but he barely reaches out. His hurt feelings shouldnt be taken out on our coparenting relationship and essentially his relationship with his daughter. Whats he going to do when I file for divorce? He didnt want to continue in this marriage and wanted to be coparents. So i gave him that and now hes upset? I dont argue with him and Im not interested in what he is doing with his life because my priority is rebuilding mine and my daughter's life. Its a miracle if he actually does a full weekend visitation every other week because hes always trying to shorten it or change weekends etc. If a serious change is needed I have no problem discussing it and coming to a fair solution. I feel that visitation time with your child is to maintain consistency for her and the parent, not to be changed to fit around your lifestyle and last minute changes because a friend asked you for a favor. How much longer is he going to be minimally involved in her life? At what point does this get better?