Why does he brush up against me when walking by?

this has happened to me a lot by him and i dont even know why! when he is walking by me and im walking by him, there's plenty of room, yet he walks soo close to me and brushes up against me... any thoughts on what it means? thanks :)

he also confessed that he was attracted to me a few weeks ago.
Why does he brush up against me when walking by?
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