An internet friend with borderline personality disorder told me to leave; Does he mean it?

I've had a crush on him for 5 years and he only found out I existed and talked to me within the past month. He's cold and unhappy most of the time, sometimes rude without realizing it, occasionally playfully morbid, occasionally more open. He claims to have given up on relationships because love has only caused him pain and rejection and he doesn't want to hurt anyone/get hurt.

Today, after a conversation ended, he came back 50 min later. I replied and he said, 'cool'. I said, 'when you say that i never know if you want me to leave'. He started saying he didn't want to talk to anyone ever again. When I said goodnight to him, he snapped at me to 'just leave'. Does he mean it or was this just a temporary trigger? Either way, what should I do? I don't want to be persistent and disrespectful but if he didn't mean it I'd feel bad for just being another person to run away from him and causing him greater feelings of abandonment.