Severus was your friend, he had feelings for you though. He wasn’t a very nice or open person, but he was to you, in his own way. He would call you insufferable with a smile of genuine affection. He wasn’t very kind in general though, to others of course. He felt bad when you looked at his with disappointment as he would tease or say something mean to someone. After he said something rude to someone, he noticed your gaze and looked away, sighing

“I wish I were better for you…”