Sex..

So I've been with my boyfriend for almost a year now and when we first started dating we would have sex almost every day and he would make sure that I got mine always. Lately though I feel like I'm doing something wrong. We hardly have sex any more and when we do usually he gets oral and I don't and then he gets his and I'm left hanging.. It makes me really upset and I feel like if I talk to him about it that I'm just bugging him and asking too much. I don't know if it's because he got a new job and he's tired more? I'm not sure what to do. It makes me feel really unwanted I guess... I don't know what to do about it.