What I found, in my last therapy, was a reenactment where my T rejected me, triggering a feeling/memory 6 months later, of being/feeling rejected by the (older) women in my family.

It was the T's stuff, and a bad ending. But, where does the realizing of that feeling about my family leave me? Luckily I had a support group IRL and this forum to process stuff on and 2.5 years later I'm somewhat less afraid of rejection, not taking it quite so personally if it happens. It's the other person's thing when they do that -- but it affected me, too, as it seems your T's stuff has affected you. Can't change that, it certainly sucks that it appears she couldn't follow through for you.

Have you considered trying some new way to get involved with people with whom you might eventually develop some form of mutual emotional/social support? The support group I mentioned above formed itself -- it's not any formal mental health thing, although all of us had a history of depression. But we met in another group that we were all members of, that we had found on Meetup.com. Meetup has more types of interest groups in large cities of course. If there's nothing that appeals to you where you live, perhaps there is some other way to find people who are interested in things you are interested in. No guarantees, of course. But in the midst of hopelessness. . .one step at a time is often all I can do.