He says he likes me but flirts with other girls, what should I do?

Anonymous
I have a crush on this guy whom I'm not dating yet. We work in the same place, same department. We flirt but I learned that he flirts with a bunch of other girls there. He says he likes me but still flirts with other girls. One time he did it right in front of my face. We were hanging out with each other and he told me he had to to go do a task with one of the guys there. But he wasn't with him, he was flirting with this new girl who worked there. I didn't care or say anything cause again we aren't dating. So I decided to go get to know some of the other guys and he caught an attitude cause I was flirting with them. And he continues to be like this even when im just being friendly to the guys.

I know we aren't dating but what should I do?
He says he likes me but flirts with other girls, what should I do?
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