Help lettering go

5 years ago I started a relationship. At first I enjoyed it. He kissed me was affectionate and we had sex. Time went on and we moved in together and later bought a home. For the past 4 years we have not had sex. He has not kissed me or been intimate with me any way shape or form. Before we committed to one another, I learned that he was seeking women on the internet and as fate would have it hit up on my friend. We decided to commit to one another and thats when things moved fast and we eventually moved in and bought a home. Time went on and I found his email up and before my eyes were emails from women he'd met on craigslist. With his picture and real name. All kinds of sex talk; let your imagination run wild. I also found on his facebook that he had hit up some women. I made fake craigslist accounts and and hit up on me. I know that he went and had intentions of meeting the fake me more than once. I didnt show. He doesnt know that I did that and that I knew of his intents to meet up with women. Also he doesnt know I know about the facebook thing. He is a we bit controlling with a loud voice when angry. I put off confronting him and eventually I did. He told me he had sex issues due to having a heart attack during sex once. Next he admitted to the acts on craigslist/email and swore that he never hooked up and swore on his childrens life. I let him stay....4 months have passed and I decided to check up on him. I have found 1 email and thats it. But its apparent that its still an issue for him. I need to let him go...Right now my mom has cancer and I lost my job of 19 years so its a delicate subject. Once I start working I need to get rid of him. I don't think he will go easily; he claims to love me. I think he loves the familiarity of having me...and he things IM AN IDIOT. So should I admit I snooped or just say I dont feel it...from guys point of view whats the best way to do it...do you think? I lost my backbone years ago.