What Are We?

I listen to your problems
You listen to mine
You hear me cry
You hear me wine

I've had other guys
You've had other girls
We've made love
And you made my toes curl

You make me laugh
You've even made me cry
I can't leave you alone
No matter how hard I try

You say you love me
I know I love you
There's no doubt in my mind
That this love is true

I'm in love with you
You're in love with me
But we're not a couple
So What Are We?