Is kising another guy while dating cheating?

Anonymous
there is a girl we both like each other we have met twice but under a long period. June 10 she wrote that she missed me but the same day I got a picture that she kissed another boy but she was drunk Need som advice feeling little bit down. She doesn’t like that guy and she was drunk. Should i just forget it. by the way we both are 18 years old
Is kising another guy while dating cheating?
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