Every day, I imagined a future where I would be with you
But it seems you had other plans; now what am I going to do?

Why did I leave you behind and leave you hanging?
How could this happen? Is this real, or just a bad dream?
I thought we would be together, but now I see the truth
Because of my ignorance, now the whole club is doomed

Who am I to trust, now that my best friend's been deleted?
Why did I let Monika try to get inside your head?

It seems that I've been misguided, could you ever forgive me?
I decided to leave you behind, why could I not see?
Blinded and careless, I forgot to check on you
I forgot to realize all the pain that you've been through

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Basically this is supposed to be the MC singing to Sayori's dead body after she hung herself...i know it's heart breaking.

But ye...this is my interpretation of how he might've felt