既然会痛心当初何必要动心明知没结果当初何必要牵手
[jì rán huì tòng xīn dāng chū hé bì yào dòng xīn míng zhī méi jié guŏ dāng chū hé bì yào qiān shŏu]
Loosely translating as 'If it Hurts Why Did I Start, Knowing There was No Ending, Why Did I Hold Your Hand'. A more poetic and complex expression of regret over beginning a relationship despite knowing its destined failure, questioning the decision made back then and lamenting over emotional investment that didn't result well.