It's a feeling most people get when they suffer due to a breakup or unrequited love..they think only if the other party can understand how they suffer, they will know what that love means to them..that's why she's saying 'someday you will ache like I ache' so he will know that she loved him and loved him too much lol
I don't know many such songs lol..that song has some of my favorite lyrics..
I want to be the girl with the most cake ..
I love him so much it just turns to hate
I fake it so real I'm beyond fake..
someday you will bake like I bake..