我喜欢你不是一时起兴
[wŏ xĭ huān nĭ bù shì yī shí qĭ xīng]
Translating as 'Wo Xi Huan Ni Bu Shi Yi Shi Qi Xing', or 'My affection towards you isn't merely momentary interest'. By adopting this nickname, a person might emphasize the genuineness and constancy of their affection toward someone special. Hereby it distinguishes serious feelings from fleeting impulses and emphasizes sincere commitment to lasting relationships.