[Harry Potter Fanfiction] Coming and Going

Harry Potter Fanfiction Where the Pairing Isn't Harry, and the Protagonist Is in Slytherin or Ravenclaw

Looking for a Book I Never Finished. I Can’t Remember Much of the Beginning Either

A cultivation novel. The female lead is cool and aloof, and only shows favor to the male lead. He's gentle and refined, lives in a little wooden cabin within the sect, and is in poor health. When he realizes he's fallen in love with her, he keeps avoiding her because he's afraid of holding her back. Once she realizes what's going on, she's direct and upfront, but she's helpless because she doesn't want to hurt him.