Am I supposed to miss you?

Am I supposed to miss you? I don’t think I should and every time I think I’m fine you come back into my mind and everything goes grey. My heart aches for you, yet I know I’m not the one.
You have others much prettier than me and I know I’m a second choice. I always have been. You made me happy now you make me cry and now I know
I should have cut you off the first time