Same here. Live in a beautiful city, cool friends, lovely girlfriend. Plenty of things exist here of which I can objectively say they're awesome, and in many things I'm genuinely interested, and so I avidly read and follow the news, whether it's social topics, economics, politics, tech etc. Yet I hold very little interest in experiencing anything personally.
If I had to describe it succinctly; I've become a dedicated spectator, but no longer wish to participate.
It's pretty ridiculous and something very strongly tells me it's the wrong way to live life, and I'd love for that to change. But the passion just isn't there to get involved anymore for even the simplest things like taking a walk outside. Again, as a spectator it's great. It's not as if I'm disinterested or don't like to hear from friends if they call me or want to visit. But calling them, or visiting them, somehow it's too big of a step.
As it's only been like this for a few years I can see how ridiculous all of this is. It's like I got the lazy syndrome: still care, but not enough to act on it. Yet it's not really laziness as I never watch TV or sit on the couch or sleep all day or get no work done... It's something else but I can't quite put my finger on it. I wish I could take some kind of hormone injection and rediscover my lost motivation for life.
Similarish postscript as you btw. Proper food, sleep, exercise, meditation, social, iteration etc, already covered stuff like that, but I'm open to new ideas.