Needing Advice

Okay, so me and my boyfriend have been together a year now. When we first got together we only argues for like 5 minutes and he would apologize, he would chase after me when I would leave, and ALWAYS would show me affection and tell me I'm beautiful and sexy. We had sex even like twice a day. Now I know that's how most relationships go in the beginning, but here lately since he got his new job, we never have sex and he doesn't show me affection AS MUCH. He still does a lot, but not as much as I would like. He works 3pm until around 3am so I understand that he is exhausted all the time. But last month I caught that he not only watched porn for two days straight, but even downloaded some into his tablet! I know some of you will be like "its not that serious, men will be men" or whatever but to me, it is way more than that. Well we didn't have sex for 2 weeks before that But he would've rather watched that and masturbated than have sex with me? And right now, we haven't had sex for 4 weeks. And it's of course scaring me that it's happening again or something. He's a guy! He would want sex more than every month right?! I haven't caught him with it since because I told him how it felt and he saw how badly it tore me apart. And every time I try to talk to him about how I feel about it, he gets mad and says he feels bad because he's always too tired. But I hate that he is bad at communicating most of the time. Especially because he doesn't see it as me expressing my feelings, but as I am bitching. I seriously don't know what to do. How should I feel about him not wanting sex as much any more? I have noticed he wants it, but also is too lazy. Which I admit I am like that too.. But it still is honestly really getting to me. 😞