You wouldn't believe how many women think their partner can (and should) read their mind. So they dont speak yet expect the guy to figure out what's going on if they just think about it hard enough. So it leads to those stupid arguments such as "what's wrong? Nothing. Really? Yep. Ok. Ok? What? It's not ok! But-- If you really liked me you woukd know and I wouldn't have to tell you!" Etc, etc....
With some couples i know it has become an everyday thing.

Truth is, no one can tell what you think. Some experienced people can read your body language and tone to figure out if you are honest, upset, sarcastic....but it always has to do with your expressions no one can actually know your thoughts before you speak!

To see that with your own eyes film yourself while telling a few sentences. Do it again but thinking about the exact opposite as you read, perhaps a few other times thinking of unrelated stuff. A week or so later, watch your videos again but not in the same order and try to guess what you were thinking about at the time of each recording. Pretty much impossible right ? Well this is all that the others see of you when you speak. Of course you can read your own mind as you speak, but in the eyes of someone else's there is no way to tell.