Perhaps it occurred to him belatedly that by admitting to having seen you at the party you could draw the obvious conclusion about him.
By picking a fight with you, he may be hoping to discredit anything you could say about him because the others in your class would think you're just saying it to get back at him.
Whatever, his reaction is very immature; I hope you can just laugh him off.
So do you really think it is possible? Because it would be a very good explanation and i would "make sense" (as long as it can really make sense to behave as he did...).



















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