I'm not sure but seeing this story reminded me of another where a girl tought she was dating a guy and the whole story was written as if she was dating him but in the end it was just an illusion and she was a stalker .
I think it's the same in the 5th story.
MAY U PLZ TELL ME THE STORY NAME? (=・ω・=)
The title is scary lessons in french it's a lot of short horror stories but I don't know if that one is already scanlated
I'm pretty sure it is the 5th story. Because the girl is stalking the guy and in her mind she is dating him. but in real life he already has a girlfriend which he marries in the future.
Oh now i understand
That reminds me of My Deepest Secret
https://www.mangago.me/read-manga/my_deepest_secret/
BL Version: Psycho
https://mangatoto.com/series/124503
1 and 2 is soo scary and 5th one is like whf means that guy dating her and screw someone else and she died because she is the one who's following him in the future poor girl..