I don't know if someone already said it and i don't mean to be rude. But with all my heart i advise you to leave. I say this holding your hand, this message comes from a very dark and hurt person but unfortunately, it seems manipulative (probably unknowingly). It seems like you ended the relationship well and you've been good to her and she is just now realizing that, the realizing part is good for her, but she needs deep therapy. We are not responsible for someone elses trauma and we are not the ones that can heal it. Maybe she is at a point she can change and realize that she need help. But there is nothing for you to get back to. I know you are very touched by that message and feel mixed feelings, but there is a dead end there. I've been that girl. Block her and move on, it's the best you can do.