Why doesn t he want sex any more?

For the first year of our relationship everything was great, we was so close and we had sex at least 2-3 times a week I lost my virginity to this man and he s my first love. Now we don t even have sex 3 times a month and when we do Theres no fore play on my side (he gets it as I m the one to initiate it) and then he looks confused when I tell him it hurts me! Because he s not getting me in the mood like he used to I realise that work is stressful at the moment so I thought he wasn t interested because of stress/depression but the other night I went to bed early and he stayed down stairs I woke up about midnight and went to get a drink noticed he was watching porn in the living room, it makes me feel pointless and there s much much more to our relationship then sex but it s getting to me that he prefers porn and I ve asked him about this & he just laughs and thinks I m joking or tells me not to be stupid and gives me a hug, I have tried the don t initiate and wait for him but it was litrerely over a month and it wasn t fair I have my needs too 😂 We love each other very much but he just likes porn more then me and I feel unattractive