Unhappy but Mother is playing mind games

Wow feels weird on this site again been gone for oh so long, to catch up to date I lost my son to the system but had a daughter. My son was founded with subdermal hematoma in the head I was arrested and only one charged for this. Well my daughter came in this world 2 years ago I love her with all my heart but not the mother anymore to be frank they still say I was stupid for taking the fall for someone else's recklessness. I told her I want to leave and not be miserable but she is using my daughter as a pawn in a game of chess states if I leave I lose my daughter I can't fight this in court cuz of what went down and I feel stupid for taking the fall now I know my heart I don't love her but for my daughters sake should I stay miserable?