Guys, Why do you think he did this?

There's this guy in my class, he's a very friendly person, u we occasionally say hello to each other. He came up to me the other day, and we started talking. The thing is I was alone at a table and he was at a table with his friends when he had come over. Then the next day it seemed like he ignored me and was only talking to my friend in that class.
Why do you think he did that?
Does it mean anything?
Did I do something wrong?
Guys, Why do you think he did this?
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