I think sometimes it's intimidating to be the first one to talk about what the song means, but here's my shot at it.
I think it's how a relationship she had fell apart.
They had a fight in the room (or a lot of fights), and she said things that she didn't mean, and that came out wrong. Then, the room was filled with silence, because the person left.
She blames herself for the person leaving. She knows she has to move on, but it's hard for her to just let them be. The four walls of the room failed her. She lost trust in the walls because they weren't able to keep the person in the room.
I also look at it as she made some kind of huge mistake that let someone else down. The walls held the secret, but eventually, the other person found out about it. So, because of her, they left.
I think sometimes it's intimidating to be the first one to talk about what the song means, but here's my shot at it.
I think it's how a relationship she had fell apart.
They had a fight in the room (or a lot of fights), and she said things that she didn't mean, and that came out wrong. Then, the room was filled with silence, because the person left.
She blames herself for the person leaving. She knows she has to move on, but it's hard for her to just let them be. The four walls of the room failed her. She lost trust in the walls because they weren't able to keep the person in the room.
I also look at it as she made some kind of huge mistake that let someone else down. The walls held the secret, but eventually, the other person found out about it. So, because of her, they left.