Caught lying about porn

My husband has always had sexual issues which I've tried hard to deal with and understand. Things are up then down in that department especially now that I'm twenty weeks pregnant. I have no issue with porn. I look. I figured he did too. It's been four years and he maintained its something he had done periodically but it didn't do much for him. He's always said he never looks at it anymore and it holds no interest to him. In the first year I double checked this a few times and asked what interested him and told him it didn't bother me, I'd just really like to be open about it. I believed him because of his disinterest in sex. Last night I found out from the computers history he has been looking. I confronted him and he admitted to looking the past four years, a few times a month. His lack of sexual interest has made me so insecure and worried I'm not enough or sexy or I suck in bed. To find out he's been masterbating to porn the entire time really breaks my heart. Maybe it's the hormones? But it's not the porn I'm mad about, it's the fact he lied to my face multiple times. I told him how laid back I was on this subject. I asked him multiple times. He maintained he didn't look. Lying to me repeatedly feels big. It feels awful. I asked him to leave for the night. I don't even feel like pretending to be OK with him. I feel like in multiple situations, he downsizes issues and I'm expected to just get over them. He's a fantastic man in many areas... But this really hurts. Am I over reacting?

And I reiterate, it's not the porn, it's the lying about it to my face.