She prefers spending time with her "girls" over you. She starts having new male friends around you. She avoids physical contact and flirts with other men. She talks trash to your friends about you. She avoids discussing your future together
The narrator has loved their partner most throughout their lives. Now they are a crumpled paper in a corner they wouldn't see. They imagined their partner would be their present and future. They planned to leave when their love was gone. The story ends with the narrator leaving on a sunny afternoon