Your roommate takes your food without asking and says you overreact. Would you keep living with him?

The context

You share an apartment with a friend. For several weeks he has been taking food you bought for your lunches without asking. When you return from work, you sometimes have to go shopping again or eat something else for dinner.

You have already explained that you prepare these meals on a limited budget and need him not to take them. He says friends should not keep track of everything and that you are overreacting. Today you find another meal you had left for tomorrow has been eaten. You can talk once more, ask him to pay for what he took and clearly separate your groceries, or look for another place to live. You want to protect the friendship, but you also need your money and belongings to be respected.