I didn't find out my fiance was an addict until after our baby was born, he had been using our entire relationship. I am still at the beginning of the emotional road, like you.
I am sorry this has happened to you. It is scary and sad to realize that the person you thought had it all together, was able to take such good care of you, that you loved, has been lying to you the entire time.
Not much advice but just wanted to let you know you're not alone.