Karma's a bitch, but so are paybacks... Care to Contribute?

Once upon a time (i.e. a couple of months ago) an emotional wreck (me) met what turned out to be an emotional roller coaster creating psychopath. Hilarity ensued.

I'm a bit torn right now. The Pathological Liar has indeed replaced me. I'm not sure whether to feel sad that a completely sketchy sociopath was able to find a girlfriend quicker than I could find a decent relationship, or to just laugh my ass off and pray for the poor soul he's after next.

I'm leaning more towards the latter. While I may not have the Sex God that I long for to sweep me off my feet and whisper sweet somethings (screw sweet nothings!!) into my ear and all that jazz, I'm realizing that I am not ready for another serious relationship right now. It's a matter of figuring myself out right now, and luckily I have a great friend who is lending me a hand in the effort. Haha, a hand... wink wink nudge nudge. Damn it, I'm a horrible person.

ANYWHO... My question is this: How do I give the crazy sketchy guy back the sentimental item he gave me as he professed his undying love for me? There's no way I want to keep it (unless as a reminder to watch out for those crazy shits out there), but am not sure how to give it back. That's where I need help.

Keep in mind...
1) I do not want to see this guy face to face.
2) He knows where I live, work, go to school, etc.
3) He's crazy (he lied about having pancreatic cancer in order to try to rope me down for crying out loud, among many other things).
4) I want to make a point. And finally,
5) I do not want to die.

What oh what shall I do?? HELP ME!