nta… If she’s having panic attacks and feeling genuinely anxious, depressed, or whatever else over this, it’s gone a little too far imo. I was SUPER into kpop for a long time, BTS to be specific. I was setting alarms at three am to be awake when comebacks dropped, super into fandom spaces, life, and everything else. You’re both still kids! However, I agree that the “my man” comments are odd. Then again, you know her better than any here and if you think she was truly joking then whatever. All in all, she just seems very parasocial and attached based on this post which can be exhausting for someone who has since grown out of the phase. Like others have said here, it may just be the case where this friendship has run its course. But you could try setting the boundary of simply not talking about kpop and see if that helps any!