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At firt glance it may seem like it would not apply to relationships because they are to complex but I think that if you start to think about it most relationships go bad because people take them for granted and don't even invest the 20% effort.
Yeah, I think the 80/20 rule is workable, until you get past 40, and then you'll find that it will begin to erode over time, at which point you can then evoke the inverse law of serentiy/expectation and begin to renunciate, and enjoy.