SOLVED. YA Thriller fiction with female main character & plot involving her Deceased Boyfriend. [s]

[SugaSimply]

Hello!
I know this is a very long shot, but I read this YA book in high school that I think may have come out in 2016 and it was what got me into reading books. Which you’d think I’d remember this book but this was over 4 years ago and for the life of me I can’t find this book. No matter what descriptive words I put into google, I can’t find it or at least anything similar, so I am really hoping that somehow someone has read this book as well or at least can point me in the right direction.
From what I remember, It was about this girl that lived in the “boondocks” or this type of wetland town. And her boyfriend d*ed who k-worded himself(he was either cheating on her or shady can’t remember lol). She had another male friend who is the 2nd character. I’m pretty sure she also worked at a diner as a waitress. She reunites with the friend after isolating him and they get close. Like spicy scene in the middle of the book close which idk why that was allowed in a high school library. I digress, she then starts getting stalked and gets weird texts and stuff. That all turns into the boy bestfriends sister being manipulated by her bestfriend who is the dead boyfriends little sister to lure the main character to a cabin to k-word her as revenge. I think the d*ad boyfriends sister gets k-worded by the other little sister, but I could be wrong.
So, yes. That is all I remember besides the book cover being light purple. It’s a very longgggg shot, but I will drive myself mad in order to find this book. Any help is appreciated and I am sorry for the horrible description<3333

[Deniseey]

Hi this is a very long shot but could it be The Foxglove Killings she works in a diner in a boondock town, there's a boy best friend who has a sister but I'm not sure about the other details

[SugaSimply]

Denise wrote: "Hi this is a very long shot but could it be The Foxglove Killings she works in a diner in a boondock town, there's a boy best friend who has a sister but I'm not sure about the othe..."

OMGGGGGG YOU FOUND IT OMG!!!!! THANK YOU SO MUCH<333 I’ve been looking through hundreds of books for the past couple of hours lol thank you so much!,