This is a tough one, especially since you have so much on your plate and have to deal with his insecurities too. I personally feel like he should be more receptive to the fact that your sex drive is low at the moment - and you've explained that it's not going to be permanent. it's valid that you're not feeling it at this moment in time with regards to sex. I honestly feel from reading this that he needs to meet you halfway and you could be a little more selfish in regards to how you are feeling.

That being said, with your busy schedule, maybe try make some time specifically for you two not related to lying around and watching netflix or cuddling/sex. Get out and do something, or even surprise him with something he loves doing and make the time about him. 

I understand it's his first relationship so you're having to take the reigns on the situation,Hope it smooths out OP but cant help but feel you should be the one needing support atm.