I saw the second half of it - thought it was very enlightening, as well as inspirational.
My cousin has had BPD for some years. Says he's never felt suicidal, even at his worst, but he knows of people who have.
When he's depressed, he draws into himself and won't contact anyone because he doesn't like to make anyone else feel depressed. He's actually easier to be around when he's like this than when he's manic. Then he's just gets himself on a high and stays there for the duration. It can be very tiring to be around him when he's like that.