Drinking can get us in to all sorts of trouble. Black out drinking is a sign that we need help amd need to stop drinking before something even worse happens. Perhaps this was your "wake up call". I am sorry to hear what happened but honestly I am not suprised. I have known many people who had horrible things happen to them because they were in a blackout and were taken advantage of. In my opinion, drinking to blackout and putting our lives in danger is a serious warning sign that we need To stop drinking and get help. If your BF cares for you I would think he would support this decision.
Just my 2 cents.