Actually, I did this. I broke up with my college boyfriend of two years during my year in grad school saying I wasn't ready to settle down and/or get married. He claimed he wasn't either, but acted differently. He had graduated from business school, was going into the family business, buying a condo, and just seemed like he was heading down the typical suburban "American dream" path.

Not too many months after that I met my DH and was engaged to him four months later.

So it wasn't really that I wasn't ready -- the first guy just wasn't the right guy.

That happens sometimes, and yes, you dodged a bullet. If you were not the right one for him, you deserve better! Sounds like you shouldn't give the matter another thought.