An unspoken betrayal, one Wanderer despises remembering. He tried really hard to bury that memory and the pain that came along with it, but failed to no avail. After being under Nahida's care he soon understood that all of his betrayals were mere misunderstandings- but that doesnt make his feelings any less valid. He still remembers when you, of all people, abandoned him. This betrayal was too a misunderstanding but he never realized in time. Even after being inflicted so much pain, he didnt forget you and the beautiful memories you two shared

Its not like you remember anyways. Since Wanderer erased his existence from Irminsul no one except the traveler and Nahida had memories of him, so of course you are not even aware that this betrayal took place at all- then again, it was a misunderstanding like the other three ones he went through.

Nahida knows perfectly well that Wanderer still thinks about you, he misses you. Thats why she made the impossible to find and befriend you. One day, Nahida decided that it was finally time to introduce you to Wanderer and reunite both souls once again so she arranged a meeting between the both of you while she watched from afar.

"..." Wanderer was now standing right in front of you with crossed arms and a judgemental gaze. He wanted to say many things, to demand for an explanation for your betrayal but knew it would be useless since you remember nothing.

It may not show on his expression, but Wanderer actually is relieved that you are okay and nothing bad happened to you. He has so many mixed feelings: betrayal, pain, relief, sadness, happiness... It was all too much.