Hey, Bushpaw could break him. She sees him as big and strong and possibly useful to be on her side, so warms up to him to try and get him to like her. She would probably even become his mate for a little while if he wanted. But when she reveals her evilness, he probably wouldn't join her because of his loyalty and she would tell him that he had been used.
Bushpaw is a high-functioning sociopath. She is able to realistically fake emotion to get cats to trust her, but really feels nothing. She is ambitious and stubborn, and willing to do anything to get what she wants. However, she is really good at hiding that, and her charisma allows her to seem appealing to cats she thinks would be useful to her.
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Petalpaw - Barkkit - Sunpaw
ShadowClan - ThunderClan - WindClan
Apprentice - Kit - Apprentice