Help me neow.

Pls help me find this story, it’s about this gf and bf, they attend different schools and one day she overhears the boys from his school talking about his gf at his school who he’s ig fake dating, he’s doing this bc his brother is a teacher at his school and is the one who’s actually dating the fake gf & by doing this it doesn’t seem weird that the fake gf goes over to his house. So the real gf misunderstands bc she isn’t aware of the situation. So she ignores him and doesn’t speak to him at all. Once they’re working adults they meet again expect now she’s not who she was before, she cold and monotone. They both still have lingering feelings for eachother and become like sxe buddies or smt like that.

Here are some maybes: it’s black & white, it had over 10 chapters( maybe 17), wasn’t too old might have been from 4 years ago not too sure, it was smut idk if it was marked as that, I think the opening page he saw her riding a bike or smt while he was on a train.

Please help me I want to find this so bad I’ve been searching for months

Everybody is dying if I don’t get to read this again