There are many instances in which people claim that a partner in a relationship should have ended it or ended it sooner, to be fair to the other partner, respect their limited time and resources in pursuit of their next relationship, etc.

Some common examples include: - Actively seeking and/or entertaining a new partner before ending the relationship - Realizing that something that is unreasonable/impossible for your partner to change is a dealbreaker for you, but not ending the relationship - Telling friends or family that you know the relationship will not work out, before having that discussion with your partner or ending the relationship

There are many variables at play in any given relationship, but most people seem to intuitively understand when something is or is not right to do to their partner.

I’m curious what ideas people have about this topic, and where they draw the line between personal prerogative and being unfair to their partner.

Please include in your comment the approximate percentage of certainty that the relationship will not work out at which someone should end the relationship.

To help focus this discussion, we will consider the issue of entering sexual/romantic relationships under false pretenses (wanting children vs not, monogamy vs non-monogamy, etc.) to be settled; most people agree that it’s wrong. It’s an issue that precedes being in a relationship in good faith, a necessary pre-condition for the context of this discussion question.