Sex Crazed Boyfriend

I am currently 6 weeks pregnant with all day morning sickness. My sex drive is basically MIA because of how sick I've been. My boyfriend, well I guess ex boyfriend just left me because he isn't getting the sex he needs right now. His mood drastically changes for the worst when he doesn't get sex. He's mean and rude and all around grumpy. My question for everyone here is: Is this normal? For a man to depend on sex this much??