Hope it goes well. If I could offer one bit of advise, I'd simply say don't go into the confrontation expecting any specific outcome, that way there will be no specific disappointments. It would be best for you to state the way you feel about what happened to you and how it affected you, and try to avoid statements of accusation. Statements of accusation lead to the person not hearing what you're really saying. By stating how what happened affected you the other person is left to draw their own conclusions regarding what you say and it is easier for them to own their part in that.
Just my advise. You of course are the one there and will do what you feel best at the time. And remember, we're here for you regardless of the outcome.
Lots of love,
“Life’s journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy ____…! What a ride!’” ~Hunter S. Thompson