While RPing, keep everything (actions, thoughts, emotions, secret messages, ect.) in the actual memo that we RP on. Nothing is to be excluded or messaged privately. Addressing secret messages, you may write them in brackets [], or some other symbol if you are concerned with keeping it a secret, although while RPing, it should be made clear that what is being said/communicated is to be made secret. It is your job as a roleplayer to assess the situation and understand that your character is not able to infer what is being said.