Are some experiences difficult to categorise? Indeed. And so are some relationships. Popova gets the grain of such relationships very well in these lines –
“Those relationships we call platonic are difficult enough to taxonomize, but when a friendship becomes punctuated by the pulse-beat of romantic love, when two people cease to know what to call each other and know only what they mean to each other, the level of complexity crescendoes and can become either destructively shrill or transcendently symphonic.”
In context is also the absolutely adorable and deeply soulful correspondence between Brahms and Schumann.
Personally, it has been destructively shrill only. Symphony awaited though not anticipated.