She rejected me and flirts with other guys?

We used to flirt a lot, and then her boyfriend broke up with her. Even though we kept flirting after that, she ended up rejecting me. Now we've stopped talking and she just flirts with other guys, including a couple of my friends. I won't lie: I feel jealous. However, I know it's not good to dwell on this, though it's hard not to. How can I get over this?
She rejected me and flirts with other guys?
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