We work near each other, I don't know him personally but he's helped me quite a lot but we've never really spoken until one day he started a conversation and then quickly ended it and left, and he hasn't helped me at the place he works since, he avoids eye contact, and leaves the room when I enter (for example he was outside when I showed up and he went inside, I went inside and he went back outside, and vice versa again) I can't think of anything I might've said wrong or anything to offend him, it was just him asking why he hasn't seen me around at the school nearby (I go to online school and he doesn't)