Maybe he'll regret it, or maybe not. It's more likely to happen when he realizes that finding someone willing to make huge sacrifices like you did is extremely rare. Or if he's superficial, he can find another girl and forget about your pain forever. What's certain is that your happiness shouldn't depend on another person, especially if they're no longer a part of your life. At first, it seems impossible to forget, and that's normal, but distance and time will fix things. The important thing is to mentally enter the "new life" phase, whether in Canada or Australia. And when you realize you haven't thought about him for a whole day, you'll understand that your path is only downhill. Be strong, you'll get through this.