I'm a 24 year old male and things just aren't working out between my long term girlfriend and myself. I would just leave but we have a daughter that's about to start preschool.

I don't want to lose my daughter as she's the best thing that's ever happened to me. The girlfriend is threatening to move back with her family and take our daughter with her. Her family lives over 1000 miles away. Can she just up and leave like this? I live in Florida and I heard parenting rights are 50/50 but I'm not sure what that means.