Try this...send an SMS message to someone in Hangouts then delete the message. Now open up the Contacts app (not Dialer) and find that same person. Under the person's details you will see a section called Recents. You will see the message you just sent and deleted with no options, at least that i know of, to delete this message. It will stay there for a few days and then will disappear. But those few days keeping a deleted message is not a good thing. I can just imagine the number of people who are cheating get caught because they didn't know their spouse, boyfriend or girl friend can see who and what recent messages they've been sending to someone, that they thought they had deleted or cleared, just by browsing thru the Contacts app. I think this needs to be changed so that if you delete your messages in Hangouts it will also delete the corresponding message in Contacts instantly. In Contacts it only shows the 3 most recent messages but that's still enough to cause someone problems.
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