They have read receipts on and I could have sworn they read it but I checked maybe 2 hours later and it just sat delivered... any ideas on what happened?
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If it's fb messenger 100% sure they marked it unread I know I've checked it.
Before marking a message unread didn't change the read receipt but now in fb messenger it does change it.
Also if the message is deleted it removes the time stamp of seen but only after a few days so more than likely the marked it unread lol