Like my dear friend Tony said 2 years ago, the question n 16 is only "would you believe me or up and leave me?". The part that said if someone happens to see? Ita just the beginning of the question, explaining the scenario.
Your presumed question #16 “if i was with some other chick and someone happen to see..........” is only a statement that leads to the question “would you belive me or up and leave me”. So there are 21 questions after all.