One of life's hardest lessons is that people aren't projects...you can't take the raw material, throw out the crap, keep the good, buy some decency and responsibility on eBay, and voila, perfect boyfriend. God knows I tried and more than once!
He is what he is and that's why he's in your past, yes? Maybe part of you never gave up hope, but it's maybe time to let that go.
Facebook...sigh. Don't get me started!