chat_history: ['I told my brother that I was planning to propose to my best friend, but I hope he keeps it a secret!', 'That sounds exciting! Is he good at keeping secrets?', 'He lets things slip once in a while, but this is a pretty big secret so I have confidence in him.']
sys_response: Fingers crossed for you!  I'm sure it will be fine.  Are you nervous?
situation: I told my brother a secret and I hope he keeps it!