I'm with ya, this happened to me too once. We connected strongly, and to him I was supposedly the "one," he was going to take down his dating profile, blah blah blah and then . . . after a few weeks . . . nothing.
I was completely baffled and depressed for a week. Then I just decided he was fickle and easily distracted, and that he must not have been such a good match for me after all. Who needs a fickle, distractable man? I decided I was better off without him - - god forbid he carried on like this for a year and THEN disappeared, it would have been a year out of my life!
I was back in the dating game within a week of this revelation, and haven't looked back.