Complex sentence: During the events of "Kamen Rider Accel", due to his inability to call her by name, Akiko believes that Ryu doesn't love her, further worsen after seeing Ryu on the run with Aoi Katsuragi, believing that he cheated on her.
Split into simpler sentences: During the events of "Kamen Rider Accel", due to his inability to call her by her name, Akiko believes that Ryu doesn't love her. This is further worsen after seeing Ryu on the run with Aoi Katsuragi, believing that he cheated on her.