lost sex drive

My boyfriend and I have been together for 2 years. We both lost our virginities to each other 2 years ago. The sex has been so consistent and good... up until now. Now I have to initiate it every time and 9 times out of 10 I get turned down. I tried to dress sexy, asked him what he liked. He would always say he was to tired etc. which I totally understand. But every time. I played a little experement to see how long he could go without anything. 2 days passed, 5 days passed, a week passed, two weeks passed and nothing. I talked to him about this and he just said he doesn't think about sex anymore and doesn't want it. He said he would rather cuddle and watch movies. Which I am always down for, alway. But I'd loved to be intimate with him once in a while. I feel it makes my bond to him stronger.