I think my friend has Borderline Personality Disorder?

I don't know about the Borderline thing (it's not the primary thing right now) but he SERIOUSLY needs to get into a drug rehab. place in order to get straightened out. When I went, it was a hugely, positive event and I love to think about that great experience. His want to feel numb from everything is a coping mechanism to deal with bad,unpleasant memories.He should look inside himself to self-evaluate.