I need to rant

My boyfriend and I have not had sex or any sexual activity in over a month. Although I express I want to, he is very adamant about not doing anything. I know it's kinda selfish but i want him to want me. I don't know what's wrong with me. It makes me question if there's someone else, if there's something wrong with me, if he doesn't see me in that way anymore, etc. and it sucks. I try to talk to him about but he just feels like I'm using him for sex when really I want that connection back with him. What should I do?