Yes, I had this experience (or codependency I guess). I was in very bad shape when I was seeing number 3 (SI, SH, life crisis due to health, leaving abusive marriage).

Anyway, at first I kept the barriers well up, but as we went to two sessions a week and started therapy by email, they broke down. I don't think she meant to encourage dependency, I just don't think she was thinking outside the moment (a habit of hers). We also both knew my seeing her had an end date (I was working outside my home city while I saw her) and I think she felt desperate for time, so stepped up things to move faster.

So it was very hard to leave due to all that, and she didn't maintain typical boundaries after I left (we kept emailing), which led to her thoughtlessness creating more problems several times. And then I went back for a session and we ended things formally--but like three months later she was doing the same thing again, though I very specifically told her not to contact me. Finally she stopped after talking to my current therapist.

I am grateful to her for some things but also still experiencing the fallout from the above at times.