OMG, I agree with you that this is weird, to say the least. Her using the phrase "dangerous choice" is so wrong, IMO. It's like she's making herself and her therapy your only hope to be OK. And the last sentence, about how your life will continue with you feeling desperate, scared, and alone...who the heck does she think she is? This is definitely an unhealthy therapist, IMO, and red flags are all over the place! I don't agree that she's trying to help you. If she were professional, she would perhaps offer to give you a referral, but not this "come back or you're doomed" BS. Good for you for moving on.

If she continues to try to contact you, I'd call the police and tell them she's harassing you. Seriously.