Tree... if one horrible moment defined and undid all the work my T and I have done together, then our relationship would have been over before it ever really began. It would have been undone probably more than 100 times by now!
You have a strong relationship with your T. Go back and do the work you need to do to understand this reenactment. I have always found that the more real I am with my T, the more he respects me for trying to come to terms with my past and not hiding it from him or from myself by desperately trying to be "good" and "nice" in order to avoid the pain and the deep shame. I am not always good and nice in therapy... far from it. But as I work through all the "badness" I find the true goodness that's a very real part of me, and I don't have to rely on a form of "goodness" that's really just a mask because I'm terrified to see what's really beneath it.