我喜欢你不是一时兴起我爱上你只怪情非得已
[wŏ xĭ huān nĭ bù shì yī shí xīng qĭ wŏ ài shàng nĭ zhĭ guài qíng fēi dé yĭ]
I don’t just like you casually; I have fallen in love because it couldn’t be helped, meaning my feelings are genuine and profound despite appearing spontaneous.