好感怎会永保新鲜毕竟热情
[hăo găn zĕn huì yŏng băo xīn xiān bì jìng rè qíng]
It roughly translates to 'how can affection remain fresh when all enthusiasm fades away?' The user may imply that feelings cannot remain as passionate or novel forever because as things change over time, so do the ways people relate to each other or feel about each other.