Maple leafs mama no one need to save any chat sessions. All will be saved automatically.
You could always retrieve your chat session under archives.. This is an option in Yahoo chat... you dont require any intentions for that. Just need an Yahoo Messenger...
People here have been using WRITTEN proofs like Emails and Chat conversations to prove ire or wier....
Firstly when you consider someone a friend how do you stumble upon his wired idea of saving the content of a chat conversation? and now when things fall apart threaten to use it as a weapon aganist that very friend?
If at all you have no evil or bad intension why did you save it?