That could have been me

My love belongs to him but his belongs to someone else

I watched you sit there
I watched you smile
I watched you laugh
I watched you get excited
Because of her
She put a smile on your face
Why couldn't that be me
All I've wanted to do was make you happy
Why couldn't that be me
I just want you to look at me and smile
Why couldn't that be me
But you like her so much
Why couldn't that be me
That will never be me
Why
Im your best friend yet you pick her
A girl who can't even tell you
If she likes you or not
One that says she likes you
75% but doesn't like you 25%
I love you 100%
But she's better in every way
I get it
But why couldn't that be me