Flirting/Sexual Interest?

Hi Need Advice (22M) : She has a boyfriend (24F) but likes me and has sexual interest. She has 2 kids and a sex worker. She has substance abuse issues and a scammer. The current boyfriend is not the father of the 2 kids. She's living in with her current boyfriend and not with her kids. She’s also my classmate. I am attracted to this girl. What should I do?
Flirting/Sexual Interest?
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