I live with my boyfriend and it definitely can be a struggle sometimes to stay away from his food.
It probably helps that I do all the grocery shopping, so I can semi control what gets brought into the house. I'll only buy junky food if he specifically asks for it or is something that's not a bad temptation for me - like his Mountain Dew. He drinks tons of the stuff so it's always in the fridge, but its just not appealing to me.
You could also try a separate cupboard just for your food (if you have the space) I find I'm more likely to snack on bad food if I'm always staring it down. If I don't even have to open that door, I won't have to face the temptation.
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