I don't have BPD but I recently met someone who might have it. He has some of the symptoms but he refuses to speak to a doctor or therapist about his issues. The symptoms he has is insecurity, he's always digging for compliments, he says he hates himself, hates his life and everyone hates him. He also said it would only be a matter of time before I hate him. He's needy and gets upset if I don't text him back quick enough. I also made some jokes and he took it the wrong way and got angry. I recently rejected his romantic advances and now he won't talk to me. I said I want to be friends. Before I met I never heard of BPD but it seems to be what he is suffering from. I'm trying to learn more about this illness so I can be a good friend. What does it feel like when you're rejected? Should I quit reaching out to him? After I rejected him he quit texting me and I only reached out once to check on how he was doing and all he said was that it was nice to feel wanted briefly. 

How can I be helpful? Should I just leave him alone? Sometimes it seems he wants me to guess what's wrong.