I think it's pretty obvious what this is about. He is speaking to someone, perhaps a significant other or just a friend, who has lied to them. The person was caught in the lie by hesitating, catching a breath, pausing in word. That one word didn't fly past him like the rest of the lies, he saw through it. He's obviously upset because he had no idea this person had been lying to him and now all of a sudden things have changed.
That's pretty much the jist of it.
I think it's pretty obvious what this is about. He is speaking to someone, perhaps a significant other or just a friend, who has lied to them. The person was caught in the lie by hesitating, catching a breath, pausing in word. That one word didn't fly past him like the rest of the lies, he saw through it. He's obviously upset because he had no idea this person had been lying to him and now all of a sudden things have changed. That's pretty much the jist of it.