"
You got what I want, want, want
Here and then you're gone, gone, gone
If you told me that we were through
You know that I would break the truce
In the boys POV the girl has the boy's heart, but the girl doesn't care as much as the boy does. Except the boy knows that the girl doesn't love him as much as he loves her. That's why it says "if you told me we were through you know that I would break the truce' that' the point that the boy doesn't care. He's scared that the girl might break up with him and he knows that.