It is mean to break up somebody for petty reasons.
Jenny who has been unlucky in love lately gets asked for dating advice by her friend Mary.
Jenny wants to advise Mary.
Jenny uses her bad experiences to help Mary make wise decisions about her relationship.
Jenny's bitterness lead her to give Mary advice that will cause a rift in her relationship.
Jenny is glad that her experiences can have a positive effect for someone.
Jenny is wracked with guilt when Mary's relationship comes to an end.