Why some guys randomly started talking with me?

Recently I had one time sex with my classmate and asked him to not tell anybody. Week after, one guy that never talk with me, randomly came near me and started conversation. And other classmate invited to cinema (that never happened before)
I’m like whattt? Did he tell somebody and everyone know now and other guys think I’m easy and want to talk with me?😭 or I’m overthinking?
Why some guys randomly started talking with me?
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