Rick, Please help!!

My husband has been unfaithful off and on for our entire marriage of 10 yrs…he has been diagnosed as an addict. Due to his addiction we had to move, and one of his APs went to our 13yr old sons school, and told everyone in front office about husbands affairs.
My unfaithful husband continued to see her after that. 

Throughout our marriage we have both made mistakes, told lies, etc. 
I have never been unfaithful or even thought about getting close to putting myself in that kind of situation.
We both had opposite sex friends on FB that we did not include each other in on.

Now when it’s time to work on things, and heal and I have questions, he says he has questions too...even questions about my past before I ever knew him.

He as told me at times he does not believe I ever cheated on him, but when we are in an argument or he is faced with dealing with what he has done then he says he has no idea if I ever cheated on him.

He says he can’t trust me, I have lied to him in the past.
And then he is on the defensive and says it’s hard for him to have empathy for me and my pain, when he is also hurting from my lies, he’s not sure I am being honest with him.

He destroyed our lives and now I am the guilty party.
Is this normal?