Man, cucking poor Mia is sad. She's in a really bad situation everyone has been or would be at some point. Loving someone without being loved hurts like a bitch
What you're saying makes sense. We've all been there. And after the first time, when I realized that the situation could repeat itself a second time, I said to myself - “Dude, fuck that bitch!”
There are plenty of fish in the ocean.
Continuing to simp someone and don't receive mutual feelings is unhealthy and can lead to mental disorders. Depression, insomnia, obsessions, getting bad habits, etc. Mia should accept reality and jump off as soon as possible, for her own good.