Why would a guy do this?

He is married, this happened at a concert and yes he is the performer, he was asking me questions and he said to another person “so easy” and that person said I know and they both chuckled, I shouted at him and told him you’re not all that. But what did he mean so easy? Does he think I’m easy enough to be used? He was making me uncomfortable and was flirting with me despite being in a relationship
Why would a guy do this?
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