heart breaking when your son tells you

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That the girls in his class pick on him.  He's six, and such a beautful and good little kid. He is so sweet and is nice to everyone. But these girls are friends with him one minute and mean to him the next. My husband jokes with him that it will be like this his whole life lol women are a mystery. But it makes me so sad.  I tell him that maybe they were just having a bad day, and they didn't mean it, etc.  he's told the teacher and she's told him that when they're acting like that to not talk to them for the rest of the day and he'll see they will come running back lol just breaks my freezing cold heart.