Any advice? sex life issues

I’m in a 5yr relationship and a couple months back I discovered some screen recorded videos of Twitter posts where the girls are naked and touching on themselves on my partners computer. I immediately confronted him and he denied ever seeing them (although Ik it was him bc only he has access to his computer) I played it off as boys will be boys. But recently I’ve felt sexually neglected by him or not receiving as much attention as I used to. That feeling of finding such vids just keeps replaying in my head. Idk if it has any correlation to what’s happening in our sex life or the fact that I never really got a answer or apology for those actions. Any advice on how to move on from this?