他不爱我我何必
[tā bù ài wŏ wŏ hé bì]
It means 'Since he doesn't love me, why should I care?', representing an unrequited feeling of affection where they think if they're not loved in return by another person, they shouldn’t waste time worrying or thinking about that person. This phrase expresses heartache as well as letting go from one-sided feelings.