What is the main conflict in Suzanne's Diary for Nicholas by James Patterson?

Suzanne's Diary for Nicholas by James Patterson is a romance. Suzanne writes a diary of how Nicholas's parents met and most days of Nicholas's life. Katie is the first entry of the Diary. Katie has the diary because Matt, Suzanne's husband and Katie's lover, gives it to her. Katie had thought that Matt had been ready to propose to her. She had had a special dinner ready and had two surprises for him. His volume of poetry was going to the printer with more prints ordered than usual for poetry. Katie has been Matt's editor and they are both pleased with this. Katie had been going to tell him that he would soon be a daddy.