Osananajimi Kanojo no Morahara ga Hidoi nde Zetsuen Sengen shite Yatta: Jibunrashiku Ikiru Koto ni Shitara, Nazeka Tonari no Seki no Kakure Bishoujo kara Kokuhaku sareta

My childhood friend is also my girlfriend. A dream come true, right? Hell no. She insults me on a daily basis. She grinds my dignity into shreds and it takes a toll on my mental well-being. I can't take it anymore. So I'm left with no choice, I'm going to break up with her. In order to maintain my sanity, it's the only option. And thus, the story of my break up begins... (Source: Novel Updates)