多狼狈你才舍得回头
[duō láng bèi nĭ cái shè dé huí tóu]
It means 'how much did I suffer before you were willing to look back?', suggesting regret, unreciprocated love, and frustration over a person or relationship. There's a deep-seated hurt that comes after enduring many hardships or embarrassments waiting for another's attention.