You with her

My thoughts have turned
From you and me
To you and her
It plagues my mind

All i see
Is your hand on her skin
Your lips kissing hers
And your bodies together as one

I don't want to touch you
Or you to touch me
For i am filled with fear
That a part of her may still linger on you

The night before this
I spent with you
We made each other feel good
I marked your skin

Then you go and do this
Tear me up inside
And you wonder why i feel
That I'm not good enough for you