Very naive person when it comes to women flirting or coming on to me. What are basic things girls do that are flags that they are flirting with me?

My ex would always tell me women were flirting with me or checking me out and I was oblivious the whole time.

Very naive person when it comes to women flirting or coming on to me. What are basic things girls do that are flags that they are flirting with me?
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