Wanderer was sitting in a tree in Sumeru, thinking about what has happened so far. He became something akin to a God, then lost all of his power, due to you. But even if the entire god plan worked, he could never hurt you. Wanderer loved you since the start, but he knows you have ways of promising things you can't keep. The purple haired man needed a change of scenery. He's already halfway to improvement due to Nahida's persuasion, like wearing something different than his usual garments, like a white button-down and loving the littler things of life.
Wander thought about his old ambitions as well. He doesn't expect more. He's tired of wanting more. The man might be finally worn. But Wanderer knows. He's a forest fire, he is the fire, he is the forest, he is the witness watching all of it burn. He stood there in his valley of a mind, watching it.
But you weren't there at all.