<human>: Could you distill the essence of the text into 1-3 sentences?

I've been a cutter on/off since I was 12.  I've been through numerous therapies, I have a psychiatrist, I exercise, eat well, sleep well, socialize, work hard in my career and maybe drink too much wine.

Both my boyfriend and I have endured emotional abuse and can relate to each other on a number of issues, including mental health.  He has been somewhat depressed recently.  He hasn't touch me in two weeks.  Yesterday, I was just super depressed and crying all day until I got to hang out with him.  Last night, I got angry with him because he wouldn't hold me, lay beside me or come to bed - because he was asleep upright.  During his emotionally abusive relationship he would wake up to his drunk girlfriend screaming at him.  

Naturally, and for good reason, he got up and left.  I hadn't cut in over two years and I just meant to scratch myself, but I used a brand new knife that just cut straight through my leg.  It was bleeding profusely so I called 911 and spent the night in the hospital, being counseled and getting 26 staples in my leg.  

I need to tell him what happened. How do I tell him? I don't want him to blame himself.  Does all this mean that we should not be together?
<bot>: How do I tell my boyfriend that I spent the night in the hospital after cutting myself, without him thinking that he is to blame for leaving me that night?