Sex with others

So I still have sex with my ex sometimes so I don't have to fuck others but I also know he wanna fuck other girls but he haven't yet and I wanna try a new dick to but still wanna fuck my ex and this guy I use to talk to 4-5 years old he is talking to me now and he's very tempting🍆😬 but I don't know if I should my ex says he don't care what I do but every time I talk to or go hang with a guy he thinks the worse and gets upset so I know deep down he still cares ... I need help😐😐😐