巧克力太甜甜到心痛
[qiăo kè lì tài tián tián dào xīn tòng]
'Chocolate is too sweet so it hurts'. Sweet food should make one happy. But here using a contradictory expression: excessive sweetness leads to distress. It could describe an excessively intense or passionate relationship, sometimes overly warm or enthusiastic things can also produce psychological stress.