@Qelix If the author is good we could have antics about their relationship then ... it would not have to end, but that depends on how good the author is. There are a few albeit only a few comedy manga that involve an active relationship.
@Dagger: It would totally change the setting from "failures+misunderstandings while seeking love comedy" to "failures+misunderstandings while in a relationship comedy". Not many words changed in those themes, but it's a whole different genre. Not that I would mind, if done well.