Feeling unwanted.

I and my boyfriend doesnt make out anymore. His reason is because he got fat and always tired of work since he is on a night shift.We dont get to the point anymore that he tried to do something to attempt making love with me. We only have sex once a month sometimes initiated by me and lately its already a month and we havent had sex. I didnt do any step to have sex with him and he didnt too. .but i always wanted him. I feel so unwanted.I was thinking that it might be because of porn,everything goes to porn coz thats the easy access since he is always tired.. I dnt knw what to do,he knows.he had an idea that i wanted to make love with him but since that im not doing anything he juz let it be..it juz so frustrating