I'm sorry, my answer may not meet your expectations. Since I am a novel reader, I cannot provide the specific name of the novel, but I can provide you with a possible plot. In this plot, the male lead, his girlfriend, and her best friend went to the cinema to watch a movie. In the movie theater, his girlfriend suddenly asked the male lead for a date and left after giving him a gray phone call. The male protagonist felt lost and confused, but in the end, he understood his girlfriend's decision and decided to keep a distance from her.