What are the ancient poems describing the suffering of lovesickness?

1, "The Operator" Song Li Zhiyi I live at the head of the Yangtze River, and Jun lives at the end of the Yangtze River. I miss you every day, but I don't see you, so I drink the Yangtze River water. When will this water stop? When has this hatred been? Just hope that your mind like my thoughts, will certainly not live up to this mutual miss. According to this, Teresa Teng sang "Si Jun" 2 and "Jia Jian" (from the Book of Songs), and the white dew is frost. The so-called Iraqis are on the water side. Tracing back from it, the road is blocked and long; Swim back from it, in the middle of the water. It's sad, and the Millennium is still there. The so-called Iraqis are in the water. Tracing back from it, the road is blocked and awkward; Swim back from it and swim in the water. The dew is not yet there, and the so-called Iraqis are in the water. Tracing back from it, the road is blocked and right; Swim back from it and swim in the water. Based on this, Teresa Teng sang "On the Water Side". These two poems are very classic works of lovesickness, and Teresa Teng's singing version is also very nice.