I share a psychiatrist with my ex and my current therapist has worked with my ex in the past too. It doesn't bother me too much though. I highly doubt he would be talking about me in his sessions (I know he doesn't go to therapy anymore anyway). I haven't even told my psychiatrist or my therapist that they work with my ex, so they couldn't put 2 and 2 together anyway most likely unless he gave them my name which I doubt. He's not one to open up about his feelings to strangers and when he does he keeps it strictly about himself. I know this about him. Plus we didn't break up on awful terms, I just broke up with him because he never had sex with me anymore (he had no sex drive whatsoever) and we had become very codependent and I had lost all of my friendships and I wanted to start fresh and rebuild my friendships. Still working on that. Plus we are both bipolar and our cycles didn't exactly match up, which caused a lot of problems.

But I can see why you might be losing trust for your therapist. I can empathize with not wanting to start over. Could your therapist recommend another therapist at the place you go to that your therapist thinks would be an especially good match for you so that you at least have the advantage of a good recommendation and not having to search around?