It sounds to me like a guy broke up with her and she's thinking back. She remembers just letting him walk away even though she clearly had something to say but she chose not to say it. Now, looking back, she realizes that the 'not saying anything' is what's eating her up inside cus she'll never know what would've happened had she just spoken her mind. It also suggests that there were multiple occasions where she kept her mouth shut, but now she regrets it as 'what ifs...' keep popping up in her mind. The whole verse where she sings about 'maybe I was never...' makes it seem like those are all the things she wished she had said or asked cus now she'll never know. She'll never know if he did love her or whether it was just a hoax. And now, the silence is what caused her own pain hence the 'Secrets told in the silence of my sin And I'm the one who loses in the end'.
It sounds to me like a guy broke up with her and she's thinking back. She remembers just letting him walk away even though she clearly had something to say but she chose not to say it. Now, looking back, she realizes that the 'not saying anything' is what's eating her up inside cus she'll never know what would've happened had she just spoken her mind. It also suggests that there were multiple occasions where she kept her mouth shut, but now she regrets it as 'what ifs...' keep popping up in her mind. The whole verse where she sings about 'maybe I was never...' makes it seem like those are all the things she wished she had said or asked cus now she'll never know. She'll never know if he did love her or whether it was just a hoax. And now, the silence is what caused her own pain hence the 'Secrets told in the silence of my sin And I'm the one who loses in the end'.