One key event was when Snape called Lily a Mudblood, which severely damaged their friendship. Another was Snape becoming a Death Eater, which was against Lily's values. And of course, Lily's death at the hands of Voldemort was a crucial event that changed Snape's life forever. After that, Snape's continued protection of Harry Potter was also a significant part of the story.
Lily and Snape's story is a tragic one. They were childhood friends. Snape was in love with Lily from a young age. However, Snape got involved with the Death Eaters, which Lily, a Muggle - born witch, couldn't abide. Despite their rift, Snape still deeply cared for Lily. When Voldemort targeted the Potters, Snape pleaded with Dumbledore to save them. In the end, Lily was killed by Voldemort, and Snape spent the rest of his life secretly protecting Harry, Lily's son, out of his love for Lily.
Snape and Lily's story is one of unrequited love and missed opportunities. They started as friends, but Snape's alignment with the wrong crowd caused a permanent break. However, his love for her endured and had significant implications in the plot.
Snape was deeply in love with Lily. They were friends from childhood. Snape's love for Lily was complex and intense. However, their paths diverged as they grew older due to different choices in life. Snape's association with the Dark Arts and Lily's friendship with James Potter led to a rift. But Snape's love for Lily never faded. In the end, he protected Harry Potter (Lily's son) out of his love for her, sacrificing his own life in a way.
One possible theme is loyalty. Snape's loyalty to Lily was unwavering, and fanfictions can explore how that loyalty manifested in different situations, like when he had to choose between the Death Eaters and protecting Lily. Another theme could be regret, as Snape may have regretted some of his actions that affected his relationship with Lily.
The love story between Severus Snape and Lily Potter is one of unrequited love to an extent. Snape was in love with Lily long before she fell for James. Snape's love was a complex mix of childhood affection and a longing that never really went away. He tried to protect her in his own way, but his choices often put him on the wrong side of the battle. However, Lily's love for James was a different kind of love, and Snape had to live with the pain of seeing her with someone else while still loving her deeply.
The story might focus on their unrequited love, the conflicts between them, or how their paths crossed in unexpected ways. It could also explore the impact of their connection on the larger wizarding world.
It could also be due to some external factors. Maybe there are threats from dark forces that he doesn't want to involve Lily in. If he is getting deeper into the dark arts or some dangerous situations, he might choose to give up on her to protect her from the potential harm that could come her way because of his associations.
Well, a lot of fanfictions depict Snape's love for Lily as a silent, internal struggle. He doesn't always show it outwardly, but it's always there, burning inside him. Some stories show how his love for her makes him protect Harry, not because he likes Harry, but because Harry is a part of Lily. This love is also sometimes shown as a complex emotion that is intertwined with his sense of self - worth. He feels unworthy of her love, but still can't let go of his feelings, and this internal conflict is explored in great detail in many fanfictions.