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He's criticising couples ("People in love get everything wrong"), but sees the positive side ("At least they're not lonely"), because he's trying to move on from a recent break-up that he hasn't taken well ("Why should I be sane without you?").
He's criticising couples ("People in love get everything wrong"), but sees the positive side ("At least they're not lonely"), because he's trying to move on from a recent break-up that he hasn't taken well ("Why should I be sane without you?").