Low sex drive & porn addicted husband

My husband and i married only a year. We have been tgt for almost 5 years. Our sex life was fine when we just started of cause. But past 1-2 years it has declined. It became to the extend where he totally dont crave for any sex at all. So 1 year ago, I brought this matter up and he say because he just want to spent time with me and not jus sex. But i told him healthy relationship require sex and it is normal. He say mayb he stress or tired. When we tried to do it, i realize he may lost his erection halfway or totally cant erect. So i feel that i must be unattractive or is it because i gained some Weight? I became depressed and have anxiety. He went for hormones check he was fine. So we keep trying, there is this 2 times we had sex ( with ejaculation) and i happened to get pregnant. After pregnant, i then realised his phone browser history has lots of porn. He have been watching porn very frequently all along including working hours he cn stay in the toilet to watch. He promise to stop this kind of behaviour but he lied to me over and over again.. Its been a year, my son is born. There is no improvement. And yet again i found out he his still watching during working hrs and still no sex drive at all.. How to save this marriage if he keep lying and do not want to open up to me. If i didnt find out, he will keep deny. I know it is wrong to even check his phone but i do it infront of him. #pleasehelp no negative comments pls..