It's wrong to fake how you feel.
Joe is having serious doubts about the girl he is currently seeing and the topic of their relationship comes up while they drive home together.
Joe wants to avoid arguing on the way home.
Joe insists that they will talk about things when later after arriving home.
Joe acts like there is nothing wrong with their relationship.
Joe's girlfriend does not bring the subject up again on the ride home.
Joe's girlfriend is misled into believing that they are on good terms.