Your Kanao and your not that good at expressing your feelings and thoughts. You use a coin to speak or not, to express or not, to react or not, mostly everything. You can't even decide anything. But tanjiro changed all of that. He was gonna say bye to you since he was leaving but he saw you with your coin. He smiled held both your hand in his "Kanao...you don't need to decide anything with your coin...say it yourself..you can do it...I believe in you.."