Hopeless fountain kingdom

Sorry

Now if you were stupid enough to listen to 'Sorry' at 12am when it first came out I feel bad for you.

Sorry is a letter to people she hurt almost.

"I've missed your calls for months it seems

Don't realize how mean I can be

Cause I can sometimes treat the people

That I love like jewelry

Cause I can change my mind each day

I didn't mean to try you on

But I still know your birthday

And your mother's favorite song"

It seems Luna is avoiding whoever in this scenario. The other person is trying so call Luna but she doesn't want to answer. At the end she says 'I still know your birthday, and you Mother's favorite song'  which means she feels bad the other person probably thinks that Luna doesn't care and Luna is just hurting.

"So I'm sorry to my unknown lover

Sorry that I can't believe that anybody ever really

Starts to fall in love with me

Sorry to my unknown lover

Sorry I could be so blind

Didn't mean to leave you

And all of the things that we had behind "

Luna probably writes that down to send to them, as like saying I'm sorry that I am not good enough to love you. I was scared to fall in love and I see that now.

"I run away when things are good

And never really understood

The way you laid your eyes on me

In ways that no one ever could

And so it seems I broke your heart

My ignorance has struck again

I failed to see it from the start

And tore you open 'til the end

And I'm sorry to my unknown lover

Sorry that I can't believe that anybody ever really"

Luna slowly realizes that the other person loved/loves her so much, the other person actually cared for her and they didn't just want to have a one night stand.

"Someone will love you

But someone isn't me "

She knows that the other person really  love's her but she doesn't want them to get hurt/ mixed up with her.