The author says she heard what she needed from a new partner to finally forgive herself.Olga Rolenko/Getty ImagesNicola Prentis cheated on her boyfriend during his 15 months' military service.She spent three years trying to earn back his trust and forgiveness but it didn't work.Then a new guy she was dating said something very simple and she forgave herself.One line of Dave Grohl's infidelity statement took me back to the aftermath of when I cheated on my Turkish boyfriend in Istanbul in 2008.