Why would a guy be nice, then mean, then nice again?

Anonymous
A guy at my school (university) was really nice to me at the beginning of the year. First he rambled on and on about random things that didn't make sense in the elevator, and always held doors for me. Maybe it was just respect, but he smiled when he saw me and was really nice. Then one night, I was eating dinner by myself (which I am okay with), and as I walked past his table, everyone stared at me. I could have sworn I heard the girls say "That's so mean!". As the guys went to get dessert, the girls turned around and asked "do you want to sit with us?". I told them no I was fine and they left me alone. After that he never said anything, or smiled, but still held doors open. He looked at me sometimes, but that's it. Towards the end of the year, he was moving out and had a lot of stuff, so I just decided to be nice and help him with the door. He was really appreciative and when I passed him a couple more times that day, he started smiling again.

I'm just confused as to why he would act that way. Any thoughts? Thank you :)
Why would a guy be nice, then mean, then nice again?
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