You should forgive someone when they apologize to you earnestly.
Carl accidentally forgot the handouts for a work meeting with his partner George and says that he is really sorry.
George wants to talk to Carl about his mistake.
George tells Carl that they really can't make mistakes like that again.
George tells Carl that his forgetfulness is indicative of a lack of dedication to the project and asks to do the presentation alone.
Carl is understanding and promises to be more dedicated to the project going forward.
Carl feels angry and left out, so he speaks to the manager that he and George share about what he feels is unfair treatment.