求翻译：当我以为终于找到幸福的时候，上天却跟我开了一个天大的玩笑。我从天堂跌落谷底，所有的希望变成绝望，所以用的承诺变成谎言。是什么意思？

When I think finally finds happiness when meeting the right one, but I have opened a great joke. I fell from heaven the bottom, all hope of despair, so become a lie.