How can we be friends?

I do regret some things I said
But my mistakes make me stronger.
Sometimes i feel that those horrible times
we shared lasted much, much longer.
Through the eyes of everyone else,
we'd be best friends till the end.
But now i realize the key to our friendship and
the truth between us is only darkness within.
Now I have built a wall and my self-esteem
is not the same.
I'm broken down and empty,
and tired of being blamed.
I won't forget the times we shared because
they were special to me.
I don't hate you, I just can't take it anymoe,
why cant you see?
You tell me that your sorry,
yet you do the same things over again.
How can i trust you?,How can we be friends?