Weak at the Knees

I cant remember the last time closed my eyes,
And fell asleep with a smile on my face.

There are so many thoughts in my head,
So many feelings I want to say.
But whenever you come around,
The butterflies wont go away.

I stumble over my words,
I buckle at my knees.
I don't know how you do it,
You make me body go weak.

My breathing gets heavier,
My heart pounding your name.
You can make me smile like no other,
But you cause me so much pain.

It's an unwritten rule,
You don't fall for your best friend.
But each time I see you,
I just fall all over again.

And I don't want to ruin anything,
So I'll just continue on pretending.
I guess it's safe for me to say,
There's no such thing as a happy ending.