His actions confuse me

We’ve been together for years and now he’s on all kinds of dating apps and talking to all these women and when he gets the chance to leave the house for a day or as long as he could postpone coming home he does I’ve asked him if he wants to split and he says no I asked if he wanted to date other women on the side so I at least know he’s with other women and I don’t get stds but he says no I even went as far as to tell him I won’t be with other men when he’s with these women what does he want