In your position, and as painful as this might be, I would be assuming that the substantive part of my work with my therapist had ended. I would hope for some final contact to say goodbye, but it does not look promising for anything more medium/long term. I would revert to self-preservation mode, not always healthy or useful of course. You can have sessions with the new therapist without committing to anything more, see how it sits with you.

I took part in a seminar recently about seduction in therapy - not sexual seduction. How client or therapist can emotionally seduce the other by (un)consciously tapping into the desires or needs of the other. It sounds like the new therapist might have seduced you with her sweet and caring way. I would be interested in exploring that with her, if nothing else.