Pat, just made some good points here, and I agree, about your and your relationship with your friend.
I'd like to add,that the cutting thing is really not a Bipolar thing, perhaps posting on the self-injury forum, you may get more replies,though welcomed of course, to post here, at the Bipolar forum.
If you are feeling so low, and/or cutting, it is within your best interest to take this up with your pdoc, or anyone in the mental health profession.
I hope all works out for you.
Take care now,
DE