How can you tell if someone’s lying over text?

Been seeing this guy every once in a while. I asked him if he was busy after I’d got off work. He responded immediately saying he was at the vet. It’s 8pm on a Saturday. Yes, I know there’s 24-hour vets, but my gut is telling me he’s lying. This is so dumb, but I overthink and don’t know how to stop it.

How can you tell if someone’s lying over text?
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