Thank you so much for playing! You actually unlocked the secret 10th ending!
This is a meta-ending that triggers after you've completed all 9 of his other endings. Wanderer breaks the fourth wall because he realizes he's in a game – and he's reacting to being "completionist-farmed".
Don't worry, he doesn't hate you, and your save isn't broken! Just relaunch the game, and you'll get a choice: either continue with this "Freedom" route, or go back to playing his regular storylines and good endings.