I think if there's a fundamental thing that people in a relationship can't agree on, then it's perfectly reasonable that they should split up. Sex seems to be pretty fundamental, and it's obviously important to this person, so why shouldn't it be a reason to split up?
I suspect if it was the other way around and it was the woman that didn't think she was getting enough attention you angry ladees would be a whole lot more sympathetic, instead of just telling her to stop being so selfish and get used to living like a nun for the sake of the relationship.