Dating My Ex's ExBoyfriend

It is a story of a girl named Yuki, obviously she is a normal girl dating with an almost perfect guy in their hometown. Did I say almost? Yes almost, because the guy that she has been dating is two-timing her with another guy. Is her boyfriend a gay to begin with? And what's the plot twist of the story? Well, sit back and relax because we're going to find out what's going to happen together -