Why would she do this?

there's this girl that i know and she doesn't like this guy at all; he's manipulative, a liar, and he talks bad about people behind their backs. she doesn't like him but she's nice to his face and is still in contact with him/still friends with him.

I don't understand why people stay in contact with people they don't like? when i don't like someone i keep my distance.
Why would she do this?
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