Eight months is amazing! Just think of the cutting as a symptom that you're facing what is going bad. My Psychologist told me that's it's ok, well not ok but understandable, if I cut while things get really bad because in some way you are facing what's making you cut. That helped with the guilt I felt, even though it became like an addiction. Hang in there sweety. You're amazing!
Do you have a counselor? That's something that really helps. Quautia is right. Just taking it day by day, one step at a time really helps. And when that gets to much, minute by minute. I believe in you. You were amazing enough to do it before, I'm sure you can one day do it again. But don't think on that yet.
Maybe make a print out of this (
http://www.selfharm.org.uk/information/why/default.aspa) for your friend. Maybe he can see that it's not because we're "emo" (Hate that word) but because we're in pain.
Good luck. Always just a pm away.
Cuddles
Sarah