Celebrity Relationships now Measured in Dog Years
Celebrity relationships are best held to a different standard - not to say that it should necessarily be lower, per se, just different. Since it's been well-established that celebrities are not normal human beings, but heavenly bodies, they shouldn't be held to regular, boring conceptions of love and commitment.
By common standards, a long relationship is anywhere between 20 and 30 years. By celebrity standards, however, a long-term commitment can be anywhere between one and five (months). If a celebrity couple makes it past an inconceivable ten years, it leaves them open to criticism as to whether they were truly a celebrity, which would be far worse than if they were to break off the relationship.
Think of it this way: we would never expect a puppy to live past 15 full years, so...