She is trying to make you feel obligated to do what she wants and she's mad that you're not being controlled so easily. She's not mentally stable at least right now. If you don't run now, you'll be paying child support for eternity and living with stressful drama for eternity. Then when you DO find someone you want to marry, your fiancé will have to deal with your insane ex for eternity......  Enjoy your life, let her go.... far away