Boyfriend hardly wants to have sex

So I’m 23 and me and this guy I’m dating who is 33 have been together for 4 and a half months and before we even hung out he was always talking about the things he’d do to me and how he wanted me so bad. (He was also going on a year with out sex) and when we hung out we would have sex but like he always made it a point sex isn’t a big thing to him like he does it when he wants to and it isn’t all the time he needs it. I’m very sexual and I never had to ask a guy for sex cause any partner I was with always was wanting but than this is the first time I ever dated someone older than me. Since we had sex he never really lasted long he always busted under 7 minutes nothing more. I always wanna have sex he never kinda tries to initiate it. When I do ask it’s almost like I’m begging him. He sometimes gives in but like I don’t think I’m getting satisfied in this few minutes so I crave sex more I don’t know. I went through his internet history and when I’m not with him hanging out he is watching porn. He doesn’t watch it a lot but coming from somebody who denied sex with me sometimes cause he’s “tired” isn’t like very nice. I love this dude and I love having sex with him and I don’t think I could cheat on him but I crave sex and orgasm or just good pleasure and he isn’t providing it and I have made this a point to him more than once. In the past I have cheated on my partner (my ex? Not my current and I have grown from those mistakes.