Sex life

Okay so I’m gonna try to sum up this long and ongoing problem me and my SO have. So We have been together for almost three years now and this has been a problem since day one. Our sex life SUCKS. When we first started talking we had sex one time and then not at all for a year!!! Now, I’m a very sexual person, I have expressed that to him and he said he understood. But nothing. I would try all the time and it got me no where. He would say he was tired from work. One day I just snapped and I yelled at him and I told him how horrible it made me feel he didn’t want to touch me. So, after that for the next couple weeks he was good. He was constantly trying to and it made me feel great. And then it stopped again for a couple more months. And we had to have another talk because I would again try and get no where. Of course after our talks he says sorry and changes for a couple weeks and now. The same problem is happening AGAIN!!!! And I can’t keep just talking to him about it because it’s not fixing anything and I feel like shit for bringing it up. But we haven’t had sex since probably April and we live together!!!

What do I do?!

P.s every time we have sex to, it’s always the same to positions. He never wants to try anything new. And it’s boring. I’m a very wild and wants to please and be adventurous and he isn’t. He doesn’t even go down on me. I don’t on him either he says he doesn’t like it. I want to spice up our relationship, but I don’t know what to do. I tried lingerie and it was a bust!!