Is my boyfriend cheating or flirting with others?

My boyfriend usually sends me the kiss emoji with the heart 😘. Today he sent me the kiss emoji without the heart 😚. Is he cheating? He would have to physically look for the kiss emoji without the heart if he had t sent it to anyone else whereas the heart emoji would be in his recent or most used emojis from sending it to me all the time

Is my boyfriend cheating or flirting with others?
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