A crying woman will be okay, and she does not need someone to rescue her from herself. She can choose to be responsible for the consequences of her choices (losing Thornton as an option) and to stop her crying all on her own.
She is an adult. Just as adult men are responsible for their choices, adult women are responsible for their choices. A woman who constantly looks for a white knight to rescue her is not a healthy woman/good prospect for a partner.
As romantic as fairy tales are, any adult woman who regularly looks to another adult to save her is simply not healthy.
You've mentioned your history and your tendency to want to save women from themselves. I would like you to get to the point where you're able to value a woman who doesn't need you to save her.
I'd also like you to accept that you have value just as a companion, and not when you act as rescuer.
W is purposefully triggering your emotional need to rescue, and I believe she is doing it to manipulate you into doing what she wants (pledging availability to her and/or relocating.) Do not allow yourself to fall into that trap.
She's an adult, and she can take care of herself, including owning the consequences of her choices. The current consequence is that by leaving the relationship she loses you as an option.
