I need advice from men

So, I, 25 F, am married to my husband, 25M, and we been together for 5 years now. I few months ago, I was fired from my job, spent some time at home and this year I started a new job, in a higher position. My new job requires a lot more from me, arriving early in the morning and leaving after sunset, Saturdays till 4 p.m.. Every day I get home exhausted, like barely functional, and he always wanna have intimate time. Don't get me wrong, we do every weekend, but we agree during the week, I get too tired for it. He also works, from home, but he leaves work at 2 p.m., go to the gym and make us dinner. The thing is, it's been a couple of week since he started to ask for intimate time every day, sometimes I say yes by message, but till I arrive home, a lot had happened, and I'm exhausted again. He asked me again today and I said no, and when I say no, he gets upset and give me the silent treatment, after some time, he tries to apologise, but it's been happening for some time now. I asked today why he was upset, and he said he feels rejected, undesirable, I reassure him it was not that, I'm just tired. So, what should I do?