明知没结果当初何必要牵手既然会痛心当初何必要动心
[míng zhī méi jié guŏ dāng chū hé bì yào qiān shŏu jì rán huì tòng xīn dāng chū hé bì yào dòng xīn]
It translates into 'Since I knew there'd be no result, why did we hold hands at the start? Knowing it would pain me so, why did I let myself fall in love?' This expresses regret over a past relationship decision.