It was the first really good one you heard and it left an indelible impression on you.
I daresay there is something in what you say - first love and all that. The eye-opening (ear-opening?) experience that reveals previously unknown possibilities. Mine came with my father-in-laws LP12 (cartridge - I never knew enough to enquire at the time - it was about the music and not the equipment!), Quad amp and B&W active speakers. I later learned that wasn't quite perfection...
So, I have continued to enjoy such revelations with appropriate investments (and yes, there were too many investments made on the basis of reviews that disappointed). I am convinced there are more such leaps of experience to be made, but now being retired I don't think I shall ever make them given the price of admission.
Oh, that other kind of first love? She's still here. The one that stops me playing jazz, blues, Supertramp, Steely Dan and The Doobie Brothers when she's around. But she did support me discovering opera in my thirties and travelling across the country three times a year for my fix at the COC. The one that was in tears this morning on hearing a choral version of The Lark Ascending. She's a keeper.

