Why do men require so much space in a relationship?

Anonymous
Why do men tend to need so much space in relationships? I've noticed that my boyfriend requires periods of time when he doesn't talk to me and needs to be left alone. Whenever I express my concern he pulls away further (We even broke up over this once), but when he's left alone it seems like he comes back better. I've noticed many men do this. What are men thinking when they pull away like this and require so much space?
Why do men require so much space in a relationship?
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