爱你是天性想你是习惯
[ài nĭ shì tiān xìng xiăng nĭ shì xí guàn]
Expresses deep and innate love combined with habitual thoughts. It conveys a profound sense of natural affection and the routine presence of thoughts about someone important. Essentially it means, loving you comes naturally to me, and thinking about you has become part of my daily routine.