I’m sorry they hurt you.
I’m sorry they couldn’t understand your love.
I’m sorry they broke you.
I’m sorry that they didn’t see you try.
I’m sorry if you ever felt like you weren’t enough.
I’m sorry if you ever felt like what you said never mattered cause it did.
I’m sorry that you had to cry yourself to sleep.
I’m sorry they didn’t acknowledge your pain.
I’m sorry they didn’t try as hard as you did.
I’m sorry if they made you feel like you didn’t amount to anything.
I’m sorry you went through this you shouldn’t have to go through this.

I know saying sorry wouldn’t do much because you probably heard it so much to the point it’s meaningless but I’m sorry you went through that they don’t deserve you whatsoever.