My boyfriend keeps archiveing girls does this mean they have messaged back and fourth and he's hiding them I've asked him but he only gets ùpset?

I try to understand archived messages my boyfriend only archive girls on his history chat some are old before we met but some are recently new

My boyfriend keeps archiveing girls does this mean they have messaged back and fourth and he's hiding them I've asked him but he only gets ùpset?
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