Why did he feel so disappointed and sad after reading a novel?

I've read three novels, and they're all still in series. This time, I read the Demon's Law.
After reading it for 2 months, I really like this novel. Part of the protagonist's experience is very similar to mine.
Don't you know that I've become the protagonist?
The author's writing is so good that I'm addicted to it. I'm addicted to chivalry, magic, adventure... ...
Now that she had finally finished reading it, she felt that he had written too much. His ending seemed to have suddenly ended like this. But now I feel like a friend/relative has suddenly left me. How could I be like this? At first, I was very disappointed. It was as if the world I yearned for and loved was suddenly pulled out of the real world. There were no more knights, no more magic...
There were a few times when I thought of the female lead and her friends, and my heart ached. There were a few times when I almost cried. It's so humiliating. I'm a man. But it's hard for me to not cry. Is there something wrong with me?
Now, I feel that this feeling is even worse than being heartbroken…...
Later, I decided to watch it again, but the more I watched, the more uncomfortable I felt…The more she saw, the further away she felt from the beautiful world she yearned for…...
I've said so much just to release the resentment I've had for the past few days. The stone in my heart has been released. Now, I feel much better…
But I want to ask, how can I get out? Why do I feel like crying so easily? Was he not strong enough? God, I feel like I'm not a man anymore. I've lived for 17 years. Why was he so cowardly?
Heroes, help me point out the way!
The feeling now was that he was suddenly pulled back to the real world in a wonderful, magical, adventurous world. Then, he thought about the real world and felt that it was very ordinary, boring, and not exciting at all…...

Answer 1

After reading a novel, one would feel extremely disappointed and sad because the plot, characters, and theme of the novel had deeply touched one's heart. A novel usually creates a virtual world and tells a story to convey some profound truth or emotion. The readers would be influenced by the plot, characters, and theme of the novel and resonate with it, thus reflecting on life, emotions, and self.
After reading the novel, the plot and characters in the novel had been deeply imprinted in his mind, and real life was no longer as beautiful as in the novel. The readers would feel lost and sad because the plot and characters in the novel represented a desire and pursuit, but real life could not satisfy this desire and pursuit. This kind of loss and sadness was also the reader's reaction to the emotions and human nature depicted in the novel.
However, this feeling could also be a wonderful experience. The plot and characters in the novel represented a kind of beautiful yearning and pursuit. Through reading the novel, readers could experience a kind of spiritual pleasure and satisfaction. Therefore, feeling disappointed and sad after reading a novel was also a kind of emotion worth experiencing.