Best Friends?

I thought you told me everything,
But I thought wrong.
I thought we wouldn't put a boy 1st,
But I thought wrong.
I thought when I cry you cry,
But I thought wrong.
I thought when I had your back you would have mine,
But I thought wrong.
I thought best friends don't lie to each other,
But I thought wrong.

You thought when you lied it didn't hurt me,
But you thought wrong.
You thought I wouldn't find out your secret,
But you thought wrong.
You thought loosing him over me was ok,
But you thought wrong.
And now you see you're the one,
hurting and I'm stronger.
But now who's there for you,
Not him but me.