As the great sage Dan Savage would say, "DTMFA."
From what you describe, there is no relationship there, and the sooner you break away from this non-relationship and find yourself a real relationship, the better it will be for you.
Frankly, I'm not even sure I would bother breaking up with him. Unfriend him, delete him from your MSN, delete his phone number from your phone and find a real man.
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--James