SO eating all my food

My bf keeps eating all of the food I buy for my pregnancy cravings. I feel like I can't have anything for myself. I buy stuff for when I feel like it so I don't eat it straight away and then when I do feel like it he has bloody ate it all. He has put on heaps of weight in the last couple of months and I know he definitely doesn't have a healthy relationship with food but this is starting to drive me nuts! What does everyone else do? I'm trying so hard to not be a bitch but I just wish he could be more respectful.