求翻译：一直固执的以为面对什么事情我都能够坦然的微笑，可是，终于在你转身决定离去的一刹那，我泪如泉涌，不可抑制。这是，过往的幸福嘲笑着心中的疼痛，原来，世界上最痛的痛是离开。是什么意思？

正在翻译，请等待...

What has been clinging to a thought that in face of the things that I have been able to calmly smiling at you, however, he turned around and finally decided to leave the moment, tears when I cannot be suppressed. This is, in the past laughed at the well-being of the heart, the world's most original

Continuously tenacious thinking facing any matter I all can the confident smile, but, finally turns around in you to decide departs the flash, I tears well up, cannot suppress.This is, the passing happiness was ridiculing in the heart ache, originally, in the world the most pain pain is leaves.

Stubborn thought that I can face anything natural smile, but finally you decided to go the minute I aren ' t over flowing steadily, not suppressed. This is, happy laugh at pain in the heart of the past, the original, the world's pain is the pain of leaving.