Communicating your wants and needs gets better with practice. At this point you have 2 choices, break up for your own sake or stay together for his. It's never too late to tell the truth. Don't wait for the right moment, just get it over with. You could always do it by text and then block him if you want to be avoidant and passive about it.

Another angle to consider is why is he lying? And what about? Some people lie out of reflex, as a response to trauma, to avoid conflict or to prevent you from being disappointed. In the microsecond one has to decide on what to say in response to a question, some people's brains are wired to give the answer that they think will be the most pleasing or least upsetting to the listener. I'm not saying that helps you to trust him necessarily, but if it's something automatic that he does, and over the stupidest things, then he may not be able to help it and it may have nothing to do with you.

If he's lying to control and manipulate that is much more sinister.

If you are done just get it over with, otherwise you are wasting everyone's time. You'll feel better once you do.