Broken Up One Day, Engaged The Next?

when Joe, my boyfriend of only six months, and I called it quits, I couldn't stop thinking that things weren't supposed to turn out this way. I must've been on to something because in just a few months Joe came calling and his "let's get back together" speech was heavy. Something like: "I want to make this work. Get married. Have kids." Could it work after our difficult break up? And for good? Well, in under a year we were engaged. And as I sit here today I can say we've been happily married for almost two years. But what was different that second time around? What made it work?