We've been best friends, For, oh, so long, It feels so right, but yet so wrong.

We've been best friends,
For, oh, so long,
It feels so right,
but yet so wrong.
You come to see me,
every week,
If only you knew,
You make my knees grow weak.
I tell my friends,
My feelings for you,
All but one,
that my love is true.
The one I can't tell
is a best friend too.
Why does it have to be her with you?