Except both of those characters have emotional reasons for doing so. One is trying to save the life of his friend and partner by insisting the situation is "unfair" (he loses). The other is saying that because she doesn't want to believe it or, alternately, to comfort a crying child (and he also doesn't deny it, just says it isn't the whole story).
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雨の日も晴れの日も
いつの日も愛してた
それだけは 今もまだ
ずっと変りはしない
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