This doesn't sound like you!

Take Smag's advice. Be nothing but civil (possibly even polite) but don't let him sit by you, etc. Put this guy totally off your radar. Screen your calls. Smag's also correct in that once you appear unavailable this guy might start trying harder. Don't be fooled by his "sincerity". (Put your prosecutor pants on, lol).

The guy's a loser. Seriously.