The 2nd one

let me be your second
dont let me be your first
come to me whnen your sure the first one has given you hurt
feel the pain washed onto me as you run back to her
and give me nothing as i give you everything and much more
leave me in sorrow as i tell you i cant take this anymore
tell me your sorry as you say it wont be done
you wont leave her
but you will come back to me
so that you'd be the cheater
and i'd be the cheaty
but i dont want that i want to be the one and only
not the second you wish for me to be