Did you ask them why there would be no point? If it baffled me, and this is just how I am, I would have brought it up at that time. If for example the same situation was presented to me, I'm sure I would have said something like "but we always hang out at that time so why would it not have been worth it that time?" would have cleared up a lot as they would be expected to elaborate.

Maybe you're leaving out more of the conversation here but is there any other evidence of outright lying that you can present? From what's here that's not the conclusion I come to per your description of the conversation.