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MetalinMyHead
My husband and I lived in a tiny little studio apartment for six months in our twenties. We co-existed quite well in such a small space (but over the 20/21 years of our marriage we've only had "discussions" a handful of times).
My recommendation is to go into the bathroom if you don't want to cry in front of your boyfriend. Or better yet, tell him what you're going through. He should know anyway. Maybe he could offer some support.