In Ian McEwan's "Enduring Love," the complexities of romantic relationships are explored, particularly the randomness and unpredictability of love. The author suggests that the selection of a partner is heavily influenced by luck, highlighting how chance encounters can lead to meaningful connections. However, the consequences of choosing a mate can drastically affect one's life, often in unforeseen ways.

McEwan emphasizes that even with extensive discussions about relationships, the outcomes are often beyond control. If a relationship ends unhappily, the tangled nature of emotions and choices makes it difficult to find clarity. Ultimately, the intertwining of luck and individual decisions complicates the understanding of love and partnerships.