在你身后煎熬你与她欢闹
[zài nĭ shēn hòu jiān áo nĭ yŭ tā huān nào]
This expresses a state of pain or agony someone endures ('torturing') in silence behind another's back. Meanwhile, that individual enjoys himself/herself with someone else ('laughing happily with her'). It portrays a situation of jealousy and emotional distress.