Guys, Why is he sweet to me, but everyone says he's an asshole?

Anonymous
My sister says this guy is an asshole, but is very sweet to me. He's about 24.
Updates:
26 d
I'm gonna add. He dated my sisters friend. So I don't know if she's being biased or not.
Guys, Why is he sweet to me, but everyone says he's an asshole?
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