What you did wasn't abnormal. Normal people do that all the time. Defense mechanisms of all kinds. I have it too but mine is to ignore the person like I don't like them, or be a bit mean if I feel rejection. But, what you did is what a "normal" person would consider stalker or weird behaviour. Its actually not weird at all, we've all been through those bouts. Just move on though. You don't have to delete Facebook, just don't take it personal.
Be slow to fall into friendship; but when thou art in, continue firm and constant.