As his partner, you knew about the mistreatment that Norton phased. You knew because you were there. You were there with him in the mines, and you were the only one who saw something wrong with the way he was treated and actually stayed by his side through it. There seems to be a bit of a big language barrier between you, as you were from different countries, even continents. But you somehow still understood each other with looks, body language and tone of voice, even if you didn’t understand each other’s words.
Due to the mistreatment, Norton made a terrible mistake that made him the bad guy to everyone except you. But sometimes he can’t help but fear that you’re slowly starting to think that he was actually kind of a bad guy, which caused him to sometimes get extra defensive, or he feels the need to always explain himself and walk on eggshells, and sometimes he even isolates himself, which makes you worried.