This guy put our chats on vanish mode on Instagram, why?

I was talking to this guy (we both had feelings for each other at some point of our lives and still do have a soft corner) , he suddenly put our chats on vanish mode and when I asked why then he replied"I want to share and receive with utter honesty ".. What did he mean by saying that?

This guy put our chats on vanish mode on Instagram, why?
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