In fanfiction, it could be due to misunderstandings. Maybe Finn misinterprets Rachel's friendship with another male character in the Glee club as something more. This jealousy and lack of communication could cause their break - up.
Mr. Schuester could be disappointed. He always saw Finn and Rachel as a power couple in the Glee club, their relationship inspiring others. He might try to mediate between them at first, but if that fails, he would hope they could both still contribute positively to the club despite the break - up.
In many Tweek x Craig break up fanfics, one common reason could be miscommunication. Tweek's constant anxiety might make it hard for Craig to fully understand his needs, and Craig's laid - back nature might seem like indifference to Tweek. Another factor could be external pressure, like the opinions of their friends or family in the fanfic's universe not being supportive of their relationship, which gradually wears them down.
I'm not sure who 'Rae Lil Black' specifically is in the context of a detective story. It could be a fictional character created for this particular story, perhaps a unique detective or someone related to the mystery in the story.
In my view, break up sex stories are quite common. A relationship is made up of many aspects, including the physical one. When it's about to end, some people may feel the urge to have one last sexual encounter. It could be because of lingering feelings, or just a way to mark the end of that chapter in a more visceral way. There are so many emotions involved in a break - up, and sex can be a way to express or relieve some of those emotions, which is why these stories are not that rare.
There was this couple. The guy planned an elaborate beach proposal. He had a big sign made that said 'Will You Marry Me?'. Just as he was about to pop the question, a huge wave came and swept the sign away. His girlfriend was so distracted by trying to save the sign that she didn't even notice him getting down on one knee. When she finally realized what was going on, she was so flustered that she said no. They later broke up because they couldn't stop laughing about the whole situation and decided it was a sign from the universe.
Well, it often depends on the specific circumstances and the characters' personalities. Maybe have an honest and calm conversation to explain your feelings clearly.
Well, in manga, a common way could be to have a serious face-to-face talk in a quiet place. Another option could be to send a message if it's too hard to do it in person. But it's important to be honest and clear about your intentions.