Why is he behaving like this?

So the guy who is in the same dorm as me, he's just next door with his older brother and I don't know what's wrong with him. He wasn't like this when i first moved in but he eventually behaves differently whenever I'm around. He seem to be avoiding me. I never approached or talked to him and i have no intention of doing so anyway but he's avoiding me. Like one time, when i was on my way to my room and he was on his way to the communal comfort room, he turned his back on me the moment he saw me walking towards his direction and then he took the longer path instead so we wouldn't cross paths. I don't know why he's like that. And then the other time, i was sitting on the area and he came and pick up his stuff hurriedly that he even dropped something. Gosh, I don't know what's going on. Does he dislike me or something

Why is he behaving like this?
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