Who Says There Is No Good Advice On /b/?
When a relationships with a disordered person ends, it leaves you in an emotional tailspin that leaves you second guessing yourself for a long time. It wasn't you, trust me. He would have done it to ANYONE he was dating. A normal person has empathy, a NPD/BPD/HPD has none. They incapable of intimacy. Check out the posts on psychforums for these 3 disorders, see if any of their stories ring a bell. Good luck. And remember, you could have done nothing to have held on to him, he's hardwired to fail.
Have some respect for yourself. It's over, right now he has no interest in you and it's not likely for him to suddenly start anytime soon. You shouldn't be giving somebody so much respect and love when it's not reciprocated, it's disrespectful to yourself. Save those feelings for somebody who will give them back to you.
Sometimes I think that anon is pretty smart.