You build on failure. You use it as a stepping stone. Close the door on the past. You don’t try to forget the mistakes, but you don’t dwell on it. You don’t let it have any of your energy, or any of your time, or any of your space.
Moving to another country for the sole reason of being with someone else is the surest way to take away experiences from their life, because you inadvertently demand that their life revolves around catering to your needs.