Why is my boyfriend mean to me, but nice to everyone else?

Anonymous
my boyfriend (of 3 months) and I go to grad school together. my class is very small so we all know each other. sometimes my boyfriend makes strange statements to me. he once called me annoying, even though someone else makes the same comment or does the same behavior and he'll laugh. I feel like it's obviously the source of the joke... ME! if I say something, sometimes he won't even respond. but he always responds to everyone else.

I've tried to write it off that he's just moody, but he seems to be nice to everyone else so I'm not sure that that explains it.

i talked to a guy last night about it and I asked him why. he told me he did this to a previous girl in his life before, but when I asked why he didn't really give me an answer, but assured me it's not just because he is using me/trying to get in my pants.

can someone give me some insight? :/
Why is my boyfriend mean to me, but nice to everyone else?
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