When I read your posts, I'm hearing a general distrust of therapists and a general theme that people are setting out to hurt or abandon you. I'm wondering if this is warranted--is it reality, or BPD? I understand that a therapist may have, at one time, caused a lot of hurt and that is difficult to move on from, but in order to have effective therapeutic relationships, there has to be some trust.

What I'm reading is that there was some boundary-setting. Maybe your therapist did tell her to stop texting you, but that shouldn't be a cause to distrust your therapist. That therapist is just as much a therapist to the other person as to you, and has to remain impartial and keep the best interests of both of you (really, everyone in the DBT group) in mind. If texting was somehow a detriment to this other person, then it was well within this therapist's responsibility to guide her to a more healthy resolution which sounds like it was to stop texting. In reality (and I know it's difficult to see this), drawing that boundary is in both of your best interests.

I agree with some of the previous posters...when I was in DBT, we were not allowed to be friends outside of the group, and I really preferred that. I think it just makes it easier to focus on therapy while in the group, makes the boundaries easier to define.