<human>: Can you give me the gist of the text in a nutshell?

This is kinda awkward and embarrassing, which is why I'm asking for help with a throwaway. I'm in a serious one year relationship and we're both 25.

So my boyfriend loves giving me oral. This sounds like a great problem to have but there comes a point where it gets to be too much. He literally wants to do it at least once a day. There are even times like on the weekends, where he wants to do it twice a day.

This is a unique problem because my exes were never into giving oral sex, so I feel extremely lucky to have my boyfriend. The problem is, he seriously looks forward to this every night and if I reject his advances, he goes from being happy to being quiet. Even if we don't have sex, he wants to give me oral. It's like, as long as he gives me oral at night, he's happy. 

Obviously there are times when we can't do it because it's my time of the month or I'm feeling shitty. A couple months ago, I was really sick and wasn't up for it, so we didn't do oral for almost 10(?) days. He acted like he was being tortured. 

This is literally the ONLY complaint I have with our relationship. He's everything I'm looking for in a future husband and there's no way in hell I'm dumping him over this. I couldn't imagine going from receiving oral everyday or twice a day to never receiving it like in my past relationships.

How can I change my boyfriend's attitude towards oral sex? We've already talked about this once and things only got better for a couple of weeks before going back to normal. There's a noticeable difference in his mood when I reject him and I don't like that. I want him to be happy all the time and not go into one of his quiet/blah moods when I say, "Not tonight Sweetie."
<bot>: Boyfriend wants to give oral everyday and when I reject him, his mood changes and I HATE that. How can I change this?