My husband doesn’t want to have sex anymore and I don’t understand why we’re a young couple also f22 m23

We’ve been together for a bit now and in the beginning he told me I had a higher sex drive then him but we used to do well I felt we would have sex about 3-4 times a week but now it had dwindled down to 2-3 times a month maybe and half the time he doesn’t even finish I don’t know what to do genuinely getting turned down all the time is starting to hurt my feelings and make me feel bad about my self he always wants head from me and I normally do that (2 times a week) I’ve tried randomly sucking his dick I’ve tried wearing sexy outfits getting dressed up I’ve tried planning it I’ve tried be spontaneous I’ve talked to him about it multiple times I feel like part of the problem is a porn addiction at this point but I don’t know what to do I even mentioned an open relationship but he told me he would feel like I wasn’t his but bitch if you don’t wanna fuck me I mean idk what to do anymore and so advice would be really nice I don’t want to leave over sex problems but like I said it’s at the point it’s making me look in the mirror different