情话莫当真只怪话太假
[qíng huà mò dāng zhēn zhĭ guài huà tài jiă]
The phrase means 'don't take love talks too seriously because they are only lies.' It expresses the feeling of being cautious with expressions of love or sweet nothings as they may not be entirely honest or sincere, implying a disillusionment with such communications in past experience.