No matter what you say. It won't change anything. You love her more, I don't understand what is wrong with me. I'm not sure why I'm not good enough. I'm not sure how you can love her more. I just don't understand. We are together like everyday. You say I'm beautiful, and pretty, and cute, and I'm a nice hearted person, and I'm special, and you've done stuff we me that you haven't done with anyone else. 
But if you love her more, than that must mean that you don't mean any of those things. You don't love me. You use me. You don't mean anything you say about me.