@Dibley How often would you do it if it were up to you?
I think it’s time you guys had a serious discussion about this. You are always asking for sex, and then worrying that you drive him away with your desires. Or you are feeling insecure about yourself, and you are trying to make yourself into the perfect girlfriend.
It seems to me you are always trying to guess what your bf wants—at least, judging by the questions you ask. You’ll do much better if you ask him what he wants. I think you guys should discuss the libido disparity between you—if there is one. You should figure out what is going on. You should figure out a way for him to decline your offer without you feeling bad. Perhaps you could figure out an alternative.
Some alternatives—such as masturbating in front of him—might excite him into a state where he will want you right then and there, after all.
The other thing to check is whether your libido is medically ok. It could be that you just have a high libido (could you trade some with my wife?), or I suppose there could be something medical that is making your libido higher than it might otherwise be. You could also be using sex as a way to make yourself feel better (as opposed to sharing love with your bf).
There is also, some believe, a thing called sex and love addiction. This is a tool to help you diagnose yourself for sex and love addiction. I’m not quite sure I think this is a sensible way of looking at this, but you can decide for yourself.
I wish you the best of luck, though. I would love to see you find more stable happiness in your life, and be able to stop worrying so much about your relationship.