Broken

What do you do when you figure out someone very close to you has lied?

So I imagine there are hundreds of blogs about this but, I wonder....

So what do you do? Do you forget? Do you act like nothing went wrong? Do you act on it? Do you fight like a mad woman?
Or do you just run away from it?
I'ts sad cause when you give you self to someone, when you open your heart, and soul . When you with your eyes closed... just belive everthing that comes out of this persons mouth and then you find out, half of what was said... was a lie. I just die .. inside.
I have cried alot these past few years. I have probably fallen as hard as a human being can . My heart has been ripped into many, many pieces and it only gets worst ... but there are somethings that even if deep down you know I SHOULD FORGIVE. , there is no way you can.

I have been lied about many things, some stupid and some real important.
Can you ever forgive 100%?