So I think very few things are unredeemable. You handled it best you could. You kept both you and him safe and went and got help. Yes it went further than it should have without intervention. I had a similar instance as a teen but I didn't tell anyone and I didn't go to the hospital. I struggled for a really long time and there were some close calls. I thought I was a horrible human being for a while which made things that much worse. I had to work through it in therapy. My "victim" has no idea. She actually thinks fondly of that time. Things happen when we are really sick. Best apology is to take care of yourself and avoid getting that sick again best you can.