我爱的人让我当了次电灯泡
[wŏ ài de rén ràng wŏ dāng le cì diàn dēng pào]
This means 'the person I love made me the third wheel'. Being a 'light bulb (third wheel)' indicates awkwardness of an extra company in what was supposed to be an intimate duo moment, thus exposing the discomfort one felt during such encounters.