Salutations... Do you all perhaps know of a novel, book, manga, movie, or show that focuses on the protagonist's journey on love, and falling out of it... A protagonist who was originally in love with an individual, but as the story goes on, the protagonist starts to lose the affection he/she once had for that said individual... It's okay if the protagonist either has a relationship with the individual or not, but there should preferably be no "netorare" or any major acts of adultery... Thank you...
A Deadly Secret - Although the story did not focus on the romance, the MC did fall for his childhood friend, then fell out of it towards the end.
Blazing Sunlight. Not really a spoiler, since you'd already expect it considering the genre and the request, but anyway: Spoiler MC has a crush and confesses to the guy, gets rejected. She's still infatuated for sometime, but moves on from there and ends up with the ML.
I don't know why the "--", but to be on the safe side, I'll just give you one title of both then. BL: You’ve Got Mail: A Cautionary Tale - it doesn't quite show but the MC was in the process of moving on but the ML was quite visibly moving on from his white moonlight NonBL: Reijou wa Mattari wo Goshomou - I stopped reading the novel after some chapters, but the MC was moving on from her ex-fiance and it's shown in more details in the manga