I keep being afraid that I'll tell the people that I work with more than I ought to also. I haven't done it, but I keep wanting to make confessions (such as that I am a self injurer, and how messed up I was even just a year ago). I've talked about this with my T, and she says that on some level it has a healthy basis, in as much as I'm wanting to be real with people, and that stuff is what I tend to see as my identity. But I still have to be careful about it, and think about the repercussions it could, and probably would, have.

In your case, where you have someone at work who knows things about you that you are uncomfortable about, I'd try sticking it out. You don't know that he is going to break your confidence, and it sounds like you like the job. Even if stuff does get out, you can wait and see how that affects your ability to work there, and look at other options at that point. You could try talking to this guy and asking him not to spread the information around, and see what he says and how you feel about it then.