Mature adults only PLEASE

please help I am havinga really hard time understanding my man. I am 27 he’s 39 I am always wanting sex he sometimes does but not as much as I do. when I try to get him to get it on> about 85% of the time hes down to do it but the other 25% of the time he says hes not in the mood and we just hang out wich if fine but then I fall asleep or go to bed and he stays up and the next morning I find the ky or a porno and I just dont understand why? why is he taking care of himself when he knows I want to do it for him? I am very UNselfish in bed I give really good head and try to do it all the time for him. when I confront him about this all he does is say iots not you, we have sex all the time, I love you and you know it. please help me understand I am not a bad looking girl I am very open to new things in the bedroom and he knows that and says he loves that im a “freak”. so whats the problem why dosent he want me? we have been together for 3 years and have lived together for one year. I guess im asking is it me? he says no but I am really upset about the situation when I tell him I am upset he says just drop it its not you everything is fine I love having sex with you its all good just let it go??? OMG I AM SO CONFUSED HELP!!!