What it boils down to is that many men are much more selfish and thoughtless than women.
My DH sometimes uses the last of the cereal and the milk, and leaves me with nothing for breakfast, even though there was categorically enough for 2 (the milk AND the cereal.) He will dump it ALL in HIS bowl, and not think 'hey I should share this with Butterfly! Or she won't have any.' I don't think there is any malice intended, many men just don't think outside the box.'
Also, when we have a box of 'strawberry crunch' cereal; sometimes all the strawberry is on the top. I will mix up the box as much as I can, and if most of the strawberry plops out into my bowl, I will scoop 90% of it out, and put it back in the cereal box. DH will just tip his milk over it. Doesn't register that if he has tipped 70-80% of the strawberry in the box onto his cereal, he has left hardly anything for me.
And as I said, if we have 2-3" of milk in the bottom of a 4 pint carton, he won't think 'I will leave Butterfly half....' He just pours it all onto his cereal and has it all.
I ALSO sometimes hide crisps, chocolates, cakes, crackers, and cheese, because he has 'greedy periods' where he nabs it all.
And sometimes, I/we WILL get something, and then split it in half, but he noshes his half real quick, and I have all mine left, and I feel guilty/obliged to share MY half. So I end up getting only a quarter of the lot - sometimes less!!! (Curse my niceness and female socialisation!) 
Annoying. But good to see it's not just my DH who does it.
I have pulled him up about it a few times, and he has said he is sorry, and he stops for a while. But he slips back into his old habits again !
To the poster who said they couldn't be with someone so greedy and selfish; this isn't a massive issue for most people, but a minor gripe. You do have to take the rough with the smooth in relationships, and anyone who expects a partner to be perfect, never mess up, and never piss them off, is in for a big shock! (Or a very lonely life if they won't tolerate peoples flaws....)
@ReanimatedSGB
I think it's possible to regard this sort of behaviour as verging on abuse. It shows a total disregard for you as a person - you don't deserve treats, you don't deserve as much food as he does, the only person who matter is him. The fact that he blames you for being distressed when he has eaten your share of food is what makes it potentially abusive. Do you have DC? Does he feel entitled to their food, as well? I have seen a few threads about greedy men who will take food from their children's plates as well as eating the children's treats (eg easter eggs) and never replace anything or apologise.
Good grief!
Take about an OTT reaction! CHILL! 
Yes, it's not great that some of our partners are sometimes greedy articles (and a bit thoughtless with it sometimes!) but there are some very OTT reactions on this thread!
Oh, and our children have left home now, but no he NEVER stole their stuff! 