My husband lying

I love my husband and I know my husband loves me but he keeps on lying to me and hiding watching porn. I get it I understand it's a thing guys do but I'm tired of him hiding it! What can I do? I have told him just to tell me and he has in the past and I never got mad about it all I said was thanks for telling me and gave him a kiss so why? I just don't understand and I don't even want to have sex with him anymore because it's like obviously he enjoys watching porn more