Let me explain.
According to the equation,
E = hf (h = plank's constant)
Energy is proportional to frequency, which is inversely proportional to the de Broglie wavelength. Your de Broglie wavelength is shorter when you're in love, whether it be familial, platonic, or romantic (trust me on this one). Thus, energy is directly proportional to intensity of love. (Intensity = the power (P) of love over the surface area of your body, which we can approximate as 4(pi)r^2.)
Therefore, the more certain of how much in love you are, the less certain of how long you will remain in that state. The less certain how in love you are, the more certain of how long you will remain in that state.
But that doesn't seem to make sense, does it? Those who are strongly in love more strongly believe that they will be for a long time. That's part of what is meant by "love is blind."
The statement doesn't make sense because our analysis was flawed. The Heisenberg uncertainty principle applies only to judgements made by an outside observer.
The stronger a love connection appears to an outside observer, the more uncertain the observer will be of how long that love will last.
Okay, this seems more plausible, but it still doesn't make intuitive sense. We're not convinced.
That's because we didn't take into account that the principle only applies at relativistic speeds to have any discernable effect.
At relativistic speeds, a person's de Broglie's wavelength becomes abnormally short, and the person experiences an condition called infatuation. As the person's wavelength further decreases, energy and love further increase toward a condition called limerence. So the Heisenberg principle becomes:
The more strongly infatuated a couple is judged to be according to an outside observer, the more uncertain the observer will be of how long that infatuation will last.
Empirical studies support this phenomenon, as experiments on such
Disclaimer: Heisenberg Uncertainty Principle