Search Results: getting revenge relationships

I've become the victim of a psycho/sociopathic narcissist at my job. Even though we are both in relationships, he sweet talked me and worshipped me. He confided all his fears in me and told me how bored he was with his gf. We flirted like crazy and were glued to each other at work until I finally fell for him. Then he denied ever flirting and said I was crazy. He almost broke up my relationship with my bf, who would murder him if he could.
of course, a year later, he's still with the boring gf, although he's dumping her when he moves away.

Now he's moved into phase 2, where I'm garbage and he's hateful and mean. No more nice guy ever. Just wants things from me, rides, references, etc. I've called him a narcissist many times and I refuse to be his source of supply anymore, so he knows I know his deal.

He's relocating several states away next month, so I'm happy to give him good a reference to get rid of him.
He was carpooling with me a lot because he only lives 5 min away. I'm not giving him any more rides but I'm a little nervous that he lives so close. He knows my bf hates him, so I think he'd stay away. I know he's run/driven past my house before.

I've stupidly told him almost all of my dirt and now I worry he will seek revenge on me. I just want him to go away quietly and I don't want to set him off.

What's the best way to do this? Just be all fake sweet, feed his ego and act like everything's great? Or do I avoid him? Or tell him off?