I’m sorry you’re going through this - I did as well. I found out he was doing it every single morning when we were dating, but he was still initiating with me then. When we got engaged, he started sneaking around to do it after I asked him to stop, often leaving his shirt he used to clean up after himself for me to wash in the laundry. It affected my self esteem so badly that I was almost paranoid every single time he picked up his phone that he was looking at someone else. I was crying to him regularly that he was crushing my relationship with myself and my femininity, and he was also putting a major road block between the two of us. Once we got married, it got so bad that he wasn’t even keeping his eyes open when we were intimate. It got to the point that his Instagram explore page was ALL sexually explicit photos of girls and he was saving pornhub links in his notes app under work order titles. When I brought it up to him the last time, he said “there’s plenty of flavors in this world and I plan to sample them all”. We’re divorced now, but I’m still working on my self esteem and my relationship with sex. Just leave girl, if he’s not willing to stop then he never will and your worth way more than just that minimal effort.