其实恋爱就是一种病
[qí shí liàn ài jiù shì yī zhŏng bìng]
A poetic sentiment equating being in love to an illness. It expresses how being in love can bring about overwhelming emotions, irrational behaviors, and obsessive thoughts as one experiences highs and lows that may feel uncontrollable or disruptive like an actual sickness does to the body.