Husband porn addiction

So i think my husband has an addiction to porn...i caught him masturbating in the toilet when we were over by his mom and he told me i saw wrong...tonight i am going through some google activity and realized everytime he is by his mom using the toilet he is actually masturbating to pornhub videos!! 830am 9am 10am 225pm 645pm he is looking at porn!! Wtf! He is 28 and im 26. What would you do? I feel like shit though...i had suspected this since earlier in marriage but damn i feel disgusted.