Why is it...

When my husband says no to having sex with me even WHEN I wear Laudre or walk naked in front of him (sorry if I spelt that wrong..) I'm not allowed to get upset but WHEN he wants sex and I say no because I have college homework to do and I know having sex makes me tired IM THE ONE that's the bad guy -.- see we just moved to Virginia Beach a week ago. I'm extremely behind on all my homework for college and I'm failing my classes. Am I allowed to be upset that he's pissed because I won't give him any? When he said no to me he was playing some video game and refused to even come into the room I was in. He said he will use it against me for not giving him any in the future like are you kidding me?! Am I dumb for feeling furious right now?