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Guess you meant "Он-то внутри" ("[But] he is inside")? "Он внутри-то" would mean something like "[But] inside, he's [got a liver, two kidneys etc.]" and correspond rather to "Внутри же он...".
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Here, those -то's (and slightly unusual word order) just add emphasis. Unless you really need to stress that you and him reacted so, oh so very differently, they can be omitted.