Is it appropriate for my boyfriend to be friends with a girl he met on a dating app a year before meeting me?

He says they’ve only ever been friends since they met a few years ago, but a lot about his story doesn’t add up in regard to her. I’m not sure what to think.

He used to sleep with girls he met on dating sites, and we met on that same dating site too, so I’m not sure I believe him when he says it was always strictly platonic with her.

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Is it appropriate for my boyfriend to be friends with a girl he met on a dating app a year before meeting me?
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