First of all a 2 week dry spell is not uncommon in a long term relationship. However, I would ask him what is going on since this is an abrupt change for you both.
I agree with the previous poster. Men aren't the sex machines we're led to believe. So when he's not asking for it, it doesn't necessarily mean he's bored/cheating/unsatisfied etc. Just talk to him and let him know that even when you two aren't sexually active, you like the reassurance. Maybe he hasn't even noticed how long it's been. It sounds like you're worried that it is something serious, and that's why you haven't brought it up yet. Might as well take the chance in knowing what the situation really is.
Maybe he is concerned about his job? Sometimes financial stresses will cause a person to not be as interested in sex.
Yeah I agree with the above posters. You could always put on something sexy tonight, light some candles, and see what happens, if he isn't in the mood, you could just express your concerns since it's been a couple of weeks and this is not usual for you guys.