"she's not you"?

So me and my guy friend were talking about how he went over to his other female friends house and smoked and we were joking about how last time he got high around me he flirted really hard, and I joked saying "I hope you didn't fold with her" (he liked her in the past) and he said "she's not you"

Is that him saying he only wants to flirt with me or?

"she's not you"?
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