HM, I am so sorry all of this has happened to you. I had a similar experience the first time I went through therapy. The boy who seemed like my soul mate, the first person I opened up to even a little, just turned weird and started cheating on me and constantly undermining my self esteem. I was devastated. We were so much alike, and he knew more about me than anyone else except my therapist and suddenly he was turning on me. It took me years to get over him (partly, I think because my T graduated and I didn't want to re-start with someone else at the student mental health place). My T also said it had to do with me getting healthier and that being incredible threatening to my boyfriend.

In the end, the best thing this boy ever did for me was to finally break up with me. I would have kept trying to make it work way longer than I should have. He kept dangling hope the way this guy is with you. What made it harder was that I didn't have many friends in my life either -- in the course of therapy, I had discovered that most of my friendships were really dysfunctional and unhealthy as well. My T kept saying that some relationships do not survive therapy, but as painful as that is, in the end it's liberating. And that was, but excruciatingly painful all the same.

For me, things did get SO much better. Getting rid of the unhealthy relationships opened up my life and my time for healthy ones. I hope that you are able to work through this with your T. I feel for you so much. Please take care of yourself and reach out for support whenever you need it.