Attraction or ED?

So my partner has been a heroin user for some time and then he also uses Fentynal. I’m not sure if that will mess his elections up, he also is HIV positive and undetectable, and so we have gotten in trouble over the past 6 years with legal stuff. Well, I had to go to prison, while I was doing my time, he cheated on me numerous times. And then I come home and we have sex for a little while like normal, and we do have tensions with each other due to him cheating and lying to me but we are working through it all. We’ll then he comes to me and tells me we need to try doing something different because he doesn’t want to be the one saying. He is tired of the same sex. So I have e asked to bring in a 3rd since we have before, but he is more reluctant. I am afraid he isn’t sexually attracted to me and once we bring a 3rd in, he will be able to get an erection and keep it as of now he can’t get one most of the time, if he does he can’t keep it up. Idk what to do