What does "Guiltless" by dodie mean?

“Guiltless” is a new song by dodie, she talks about this person who’ve hurt her feelings, yet they are unaware of it. I am sure that most of you reading this can relate to this story; which makes this song even more beautiful.

It’s about sadness, bitterness, and forgiveness… A relatable topic, a great clean simple melody, and a cool music video; so lets talk about it.