You dodged a bullet, is what happened.
Obviously this guy has found somebody else he wants to date, and he's too much of a chicken to tell you directly because he's scared you might be slightly upset with him. I doubt that butt-dial was unintentional.
In short, he's a loser and you're well rid of him. It's too bad he didn't have the decency to speak with you, but still, you win on this one.