I can totally relate to this. With one therapist I had, I knew way too much about her life. In the end I realized that she was really an untrained therapist, (though she'd been the field 25 years, unlicensed) and so really didn't know about boundaries though she claimed too. So I heard (and read online) in articles she posted, about her son's experience with bullying at school, her elderly mothers altshimers, and other issues in her life. I met her teenage son, who it turns out participated in the same training program I was part of for a time as well as a therapy group. Yeah, real ethical issues huh?
Anyway, my VMT therapist has a more middle ground I think. As we worked together more and more slowly I learned more about her. After a long time of talking about my alcoholic family, she told me about her mentally ill sister and how the dynamics are similar. I learned about her relationship with her sons when we were talking about my relationship with my mom. I'd actually love to run into her outside of therapy, I think it would be really neat. I'd proably scream her name and be like hi! I know she has a new puppy, which I met. I'd love to go to her house, but I know that's out.
I would recommend talking with your therapist about this.