Oh man, that's rough. This is one of many reasons why I'm wary of, ...well, just about anyone, and also how I am with a professional; at the end of the day, they're doing their job. I think you shouldn't give up on therapists, ... there are some amazing ones out there.

My therapist was wonderful; she was incredibly intelligent, understanding, and had a hint of honesty that helped, but she never crossed any boundary. In-fact, I felt super uncomfortable meeting her in a local coffee shop (was an assessment of my anxiety or something) but it was fine.

Sorry, I went off a bit, but what I'm getting at, is not all professionals are unprofessional. Look for someone renowned, licensed, someone with all the proper checks.

I understand about trust; that's an issue of mine as well, as is opening up (to a point, on both accounts) but... I dunno, I guess in life you have to make the occasional leap of faith.
I think it's good that you're here on PC ( by the way) as it gives you a way to release some of the burden.
Honestly? I personally think that one shouldn't ever look for (or accept) a friend in a therapist; it's a very risky game, for your feelings and mental-health, as well as their ability to do their job.

As far as I know, it's common for attachments to occur during therapy, and that can be to the advantage of the therapist, and of course the support/treatment of the individual getting therapy, but of course it can also go the other way. It might be possible that your therapist was just clumsy; she may have meant well but ultimately made a mistake, one for which I'm betting she's feeling very guilty.

Stay safe and keep us updated, if you feel you can.

EDIT: Sorry, one last thing: I just wanted to say that I think it's brave of you to come here and share all that.