Can't say I've quit metal before, but I've had "more" or "less" metal moments throughout months. I've been a metalhead for 25 years and I seriously doubt I'll stop listening completely to this genre. It's so damn good and addictive.
One aspect I truly enjoy from metal is its diversity and global transcendence. Metal has been reinvented and adapted countless times. Literally every country has at least one band, in a heap load of languages... yeah, I'm willing to believe even the freakin' South and North Pole has metal bands consisting of penguins, walruses, exiled souls, aliens and whatever creature lurks in there. That's how great this genre has become over the years.
Nowadays, I combine my regular metal playlist with any stuff that catches my ear: blues, rock, jazz, punk, "banda" music (very popular/traditional in my country), fusion/tropical (thanks, Cynic), Darkwave, EBM, Aggrotech, Industrial, folk, Dungeon Synth, Dark Ritual, classical, rap and so on.
I don't have pals who like metal as much as I do. I'm ok with that. Some of them can't stand Iron Maiden for more than five minutes, hahaha.