By 1977, Dahmer's grades had declined; his parents hired a private tutor, with limited success. The same year, in an attempt to save their marriage, his parents attended counseling sessions. They continued to quarrel frequently. When Lionel discovered Joyce had engaged in a brief affair in September 1977, they both decided to divorce, telling their sons they wished to do so amicably. Lionel moved out of the house in early 1978, temporarily residing in a motel on North Cleveland Massillon Road.