Can my employer read my WhatsApp messages on my personal phone?

Not fully sure if this is the right place for this. Just wondering if my employer is able to access my WhatsApp messages on my personal phone? Had an encounter a couple years back where they’d brought up messages I’d sent over Facebook Messenger, nothing untoward but it still made me uncomfortable, and I’ve since switched to WhatsApp as I know they’re encrypted but are they still able to access and read those? I don’t fully understand how they accessed …

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