Unread generally means they never saw the message. Maybe they had no internet connection or their phone battery was flat, so they couldn’t read the message yet.
Left on read means they saw the message (as verified by a read receipt) but didn’t respond, usually indicating they don’t want to respond, which could be for dubious reasons. Two very different scenarios.
If you say so.
https://www.dictionary.com/culture/slang/left-on-read
Unread generally means they never saw the message. Maybe they had no internet connection or their phone battery was flat, so they couldn’t read the message yet.
Left on read means they saw the message (as verified by a read receipt) but didn’t respond, usually indicating they don’t want to respond, which could be for dubious reasons. Two very different scenarios.