need advice! help!

so my boyfriend is never in the mood. I'm lucky if we have sex once a week.... I try everything and he never wants it... blames it on stress, being tired, or just plain not in the mood. i am always initiator and the last time he came on to me(not having had some drinks) was july... I'm startung to feel like its me... but anytime I try to tell him how I feel he either ignores it or just tells me its not me and gives me all the excuses listed before. I really don't know what to do. Help!!!