I'm thinking that the "ditch the jerk" idea is the way to go. On top of that it sounds like, from your description it was never real deep, just dating to marriage talk in 0 seconds, kind of thing and you never really had a chance to have a real relationship. That's my take on that part.

As for the FB? if you're moving on, and there's no closure issues on your part, there is no reason to keep someone as a contact/friend that isn't even responding anyway. If my interpretations of the warning signs are correct, this can very easily lead to being stalked by this person and "watched". Just seems to fit the profile.

Don't worry about this guy. You can do much better.