Endless Disguises: Sources of Sadness

She was smiling in front of me and it looked very convincing. But I knew it was just a disguise, and behind it were countless other disguises. And only when I reached the end of those disguises, will I reach the source of her sadness. I could see tears falling down her chin behind the image of the smile she was showing me. And her actual mouth, that was forcing a distorted smile while gritting with sadness and regret.