One example of a poem with the theme of missing someone is "The Night" by Hilaire Belloc. Another example is "The Philosopher" by Edna St. Vincent Millay.
"The Night" is a poem about not know what to do in the absence of a lover. It expresses sadness, confusion and longing. Belloc describes the depression that comes after a lover leaves and ways one punishes themselves in the aftermath. Born as Joseph Hilaire Pierre Rene Belloc in 1870, Belloc was a well-known author in England during the 20th century. He had strict orthodox Roman Catholic beliefs and the cultural conclusions he garnered from his these beliefs are the main themes of his works from 1920 to 1940.
"The Philosopher" is a poem that questions the reasons the author has for missing someone. It also describes behaviors that are caused by missing someone such as not sleeping well, being listless and crying.
Millay was an American poet during the 20th century who had a lyrical style. In 1923 she won a Pulitzer Prize for Poetry and is considered by many to be one of the most respected poets of the 20th century. Millay coined the phrase "my candle burns at both ends" in her poem "First Fig."