How to recover friends chat history?

[squathub]

Hi, ok I have one message dated in October but I know for a fact the chat history goes back many months. There ia no message to say friend has delted messages! How can that happen? And how can I recover the chat history? If possible..and I didn't back it up

 

[anon(10614692)]

You can not recover something not backed up since there's othing to recover