Insecurity, jealousy, and other women

My husband and I have been together for 3 years and he’s had issues with lying, ones that he says he’ll resolve and it never happens. These lies are only about sexual behavior (as far as I know), such as his addiction to porn (I don’t mind a normal amount of porn, but the addiction was a problem). When I discovered he was looking at half naked photos of my childhood best friends a week before I had our daughter, I was and am rather upset. Not just glancing as he scrolls through, but going out if his way to look at them. These are photos posted to social media, not sent to him directly, but I can’t shake the feeling of betrayal. I keep telling myself he’s a man and him looking at other women is something I just have to deal with (I have a pretty low sex drive and truly have no desire look at anyone else). But he lied directly to my face about it and continued to lie until I was clear that I know the truth. I just feel like after all the lying and feeling so insecure and jealous that I don’t know if it’s me or him that’s the problem. I know I need to work on my issues but I feel like maybe he’s the one that caused them. After so many lies I feel like I can’t trust anything he says and constantly wonder if my entire marriage is a sham and if he’s been messing around behind my back, since I know he has a tendency to lie about everything related to sex. Any advice?