No he didn't mean to. Ender just wanted the boy to stop hurting him so Ender tried to inflict pain on him. When he pulled the other boy, he didn't expect him to go flying and break his arm. It was all unintentional.
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No, Ender did not intentionally mean to break the other boy's arm. It was a result of defending himself in the battle room simulation where he was under immense pressure to win. He felt regret and guilt for his actions.