I Was Cheated On

I fell in love with this man. He was good to me and treated me like a true princess. Never lied to me and he loved me deeply. I know it, I believe him. I have a gift of knowing who lies. So I know it he loved me, and still does.
A while back he started withdrawing and I knew something was wrong. Last week he broke up with me saying that it will never work out between us though I knew he was hiding something.
Because I was hurting I was posting things on facebook and I wasn't taking care of myself, wasn't eating.
He contacted me today, saying he doesn't deserve all the hurt and every time he knows I am hurt he gets angry and he hates himself. then he admitted that once he got drunk and cheated on me that's why he broke up with me because of the guilt. That's why he couldn't look me in the eye. He said he doesn't deserve my love and he doesn't deserve my tears and he made me promise him to take care of myself and eat. He made me promise him to be happy that would make him happy.
For the whole week, I was asking myself why he broke my heart. And I was hurting, I thought he stopped loving me, I thought he played me. But now that I know the truth, I wasn't angry. I felt lighter. My heart felt lighter.
My reaction is confusing me. I forgive him from my heart. I truly do. I don't know why I am reacting this way.
Does it make me cheap and unworthy and humiliating myself if I forgive him and even want to fix things between us?
I don't know, another girl might hate him, I tried to hate him, but I couldn't hate him, I couldn't find any ounce of hate or anger in me. what's wrong with me?