Is there such thing as to much porn?

Ok ladies I totally get it guys watch porn and so do women for that matter. My fiancé use to watch porn so much to the point where he would rather watch it then have sex with me. It created a lot of problems and then he promised me he was going to stop. Well he goes to bed early because he has to be up very early for work. I was going to the car to get something and said I'd be back to say goodnight. Well I caught him watching porn and he kept lying to my face about it. Then got mad at me for just walking away and not starting an argument. I feel so betrayed and honestly don't know what to do.