She added me to her close friends. What does it mean?

So this girl and I are call online (Twitter and IG). We got things in common (working out and sports). So we dm and voice chat from time to time to vent about our relationship situations. So yesterday I saw she added me to her close friends. She was posting half nude and talking about she’s about to have sex with this guy. My question is, why she added me to her close friends?

She added me to her close friends. What does it mean?
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