Most Helpful Guy
go and live your life, if he truly wanted to be in a relationship with you he would've asked you already, you did the right thing, he might reconsider what he has lost and crawl back.
the strongest negotiating position is to walk away and mean it, thats what you did, if he never comes back then you won, best wishes.
Most Helpful Girl
You don't give an ultimatum unless you're going to follow through. If he doesn't want a relationship then it was over anyway, you just would have been settling for less than what you want.