There are some out there. However, this concept is quite a wild departure from the original 'Harry Potter' lore. Some fanfictions might explore this idea in an interesting way, like delving into how Hermione would react to such a revelation and how it could change the relationships in the wizarding world. But others could be poorly written or just too far - fetched for most fans.
Hard to say. Maybe it took inspiration from real-life situations but was heavily dramatized for the story. It's common for such works to blend fact and fiction.
It could be that he has never truly reciprocated your love, care, or friendship. He might have been indifferent to your needs and feelings while expecting you to be there for him unconditionally. This imbalance in the relationship could be the real story behind why he's not worth dying for. You deserve to be with people who value you as much as you value them, and if he doesn't meet that standard, then it's a clear sign that your life is far more precious than any loyalty you might have felt towards him.
That depends on what you're into. If you like exploring different character combinations and don't mind some more mature themes, it could be worth it. However, if you prefer more canon - compliant stories, it might not be for you.
There are indeed. A lot of fanfiction writers explore this rather unusual dynamic. In some of these stories, Voldemort's protectiveness of Hermione might be due to her unique magical abilities or knowledge that he wants to use for his own ends. Or perhaps there's some kind of strange connection formed between them that makes him act in a protective way. It really depends on the creativity of the writer.
Without more context, it's hard to say exactly who 'he' is. It could be any fan of the Harry Potter series who has a particular interest in Hermione and has created or taken on some form of ownership in relation to fanfiction about her.