my bf is a monster just bc he watch porn?

i feel so bad for posting here, idk what i wamt i have so many thoughts abt the feelings i have for my bf im scared my thughts are true or that they will be true and i feel bad for feeling amd thinking this way i such a bad girlfriend, i am scared that i like other people just because i look at them or talk to them normally and i feel like a liar what cam i do to stop feeling like this i am scared

I'm 18, and been in a relationship with my man for nearly 2 years. I started living with him around 2 months ago, and all I do is think about if he's cheating. We were long distance for a year and a half of our relationship, maybe seeing eachother once every month or two. I decided to move in with him, and ever since all I can think about is if he's cheating or watching porn. When he's in another room I think he's doing something wrong, I have to check on him every ten minutes to ease my anxiety. I didn't have this problem before moving in. Granted he has talked to some girls on his phone, even having his ex on his phone (didn't do anything bad) and he is porn addicted though he is getting better for me. It's gotten so bad I want to leave him. A couple days ago I broke up with him and it absolutely broke my heart, I couldn't bare it so I gave him a month to show me he can do better, and for me to work on myself. If I'm still unhappy with us I'm going to leave. I love this boy more than anything. I'm scared to be without him, this is my first real relationship. At this point I refuse to even sleep until he is sleeping. I don't want to start over, I don't want to leave him, but I really can't take this pain it's causing me. It's all I think about. I've convinced myself so many times that he's cheating, but I know he wouldn't. I question whether it's anxiety or intuition. Maybe I just know deep down he really is cheating and I just don't want to believe it. I don't know. I don't think he would do that, but at the same time he's really into women. I hate that he looks at other girls in a sexual way, it bothers me so much, and we talk about it often, but with it being an addiction it's difficult. He has gotten a lot better since we have talked about it. He understands I have an issue and is usually happy to talk about it over and over and promise me over and over that he's not cheating. He allows me to have his phone whenever I want and everything, I have no reason to think he's cheating, but I can't get over it. It's not fair to him either. How do I deal with this? How do I stop hurting so much?

I’ll preface by saying he’s a brutally honest guy who doesn’t feel like there’s anything wrong with being honest. But um… yeah. He says I concentrate on the bad too much instead of all the good. I said I feel the bad is still there lingering during the good. He doesn’t compliment me like my previous boyfriends have unless I’m absolutely dressed to the nines, and even then, I can barely get it out of him. I’m a few years older than him. The other day, I asked him if he is sacrificing being with his type to be with me, and without missing a beat, he said “yes.” Basically, his type would be skinnier, younger, hotter than me (shocker, I know). I showed him a photo of myself that I liked, and he said “meh.” I tried to be confident and said, “well, I know it’s good, and that’s all that matters.” He asked what I liked about it, and I said my cheekbones looked good. He said he “only saw cheeks.” I said, “yeah… kinda hard to see cheekbones without seeing the cheeks…” He then proceeded to poke at my face/double chin, and when I asked what he’s doing, he said, “Trying to find the bones.” In the same convo, he said he hasn’t wanted to sleep with me because of my weight. Said he wishes he could see my waist more. I’m 10 pounds heavier than I was when we met, and that’s nothing. He’s gained way more in this relationship, but I don’t give him shit about it. He says “well maybe you should.” But I’m not gonna go insulting him just because he insults me. When I tell him it makes me feel bad, he says, “well I wasn’t trying to make you feel bad, so…” Anyway, I know it’s not just ROCD. I deserve better than this. But ROCD still makes me question myself. Mad af at him ngl