Is this the clingy ex that would ask you to buy him shit, Lan? Fuck him. No, not literally. Just block him. If you are like me and don't have a phone that CAN block because RIM are IDIOTS, then call him up, be MEAN, and make it clear you do not want to see or hear from him again.
Or, in my case, have phone sex with him with the promise that you want to get back with him, and afterwards say, that was awful, you are boring, get out of my life, do not call me. It is unfortunate, but sometimes you have to be a JERK because people just can't handle it's over when it's over.