So broken 'things' don't always get mended because it's become cheaper to replace them. Unless we're talking priceless antiques.
But what about broken 'nebulous things' (yep, still thinking interpersonal relationships) - since these aren't priceless antiques and since we tend to avoid drama at all costs, do they just sort of get left alone to fester? In the hope that time heals all wounds?
Or more to the point, in the hope that people will forget and move on, as they often do.
My feeling has always been, it's the coward's way out to rely on the shortness of people's memory. Grow a pair and admit your shortcomings, dammit. And fix things.
Interpersonal or otherwise.