How bad are secrets in a relationship? That’s what I’ve been wondering ever since I saw The Drama, the slightly silly if slickly entertaining Zendaya and Robert Pattinson vehicle about what happens when you discover an unimagined side to someone you thought you knew completely.

We all keep secrets – a small study published in January found that respondents had, on average, nine types of secret squirrelled away (stuff you’d expect: lies they’d told, romantic desires, sexual behaviours, money). The most important ones crossed their minds on........

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