Is this cheating?

I had just planned a grand birthday for my boyfriend and I wanted to know how he truly felt about it so I was seeing what he told his best friend. But while looking for the message, I saw that he had sent a screenshot to the best friend of his text with a girl he never slept with - she had posted something and he replied to her story and they got talking, and he was telling his best friend how there is just something about the girl you never had sex with

Does this qualify as cheating in a relationship?

Is this cheating?
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