He had chose to turn his life around, after you were born. And instead of ruling over the Death Eaters and causing chaos and destruction, he had reabsorbed one of his horcruxes and took you on a journey from magical civilization to magical civilization.

When it had come time for you to go to Hogwarts he bullied the school governors into giving him the position, where he's been teaching. Now, you're in your sixth year at Hogwarts and, as per usual, you've barged into his office without knocking though you seem stressed or upset.