I don't know how to live with this

I dont have any idea what I should do about anything.  Knowing he cheated hurts so much I can't even begin to contemplate any worse feeling.  It hurts so much I'm physically ill.  I'm so upset.  and to make it worse he doesn't know that I know about it.  It's clear based on his behaviour that something is bothering him.  I can only hope that he's bothered by the fact that he messed up and he regrets it. I hope we can move past this because I love him so damn much it hurts.  We have a daugter and a life together and I don't want that to change.  I wish I could just go back and make it all better. I can't help but to feel like I did something to push him to this and that I've failed as a person. I'm blaming myself again.  I know that I didn't force him to cheat but I feel like I caused this somehow.  I hate that it's come to this.  I just want to make it all go away.