I totally know where he's coming from.
Back when i started learning japanese,
in 2000 maybe, i had so many ups and downs with it.
I started , then left it, then started and left it...
No cool technology like now...
But in the back of my mind I always had a dream
of working in Japan , etc.
I achieved my dream of studying in Japan, of working in Japan with real japanese people. In fact I still work with them up to this day (super anal people them japanese).
And after 12 years with it.. I still have on and off periods.
Just like when you are dating someone,
learning japanese is a lot like a relationship.
At first, it's all magical and glamorous , but there comes a point when you get desensitized to it.
I'm pretty sure a lot of people have either reached this level, or will eventually.
It's just a part of you, it's how your brain works.
Working in Japan was a huge eye opener for me.
One thing is visiting japan, another one is working in japan as a foreigner, and another one is working there as a Japanese (long live the leader type of work)....
I realized it's not for me, but I totally fulfilled my dream and i'm satisfied with it.
Now I work at a japanese company in america with schedules that protect me and don't try to kill me, and i'm learning a lot,
but still it's crazy how they think.
You will go through a lot of periods in your learning and i'm sure it will be different for everyone.
But if it's really for you, no matter when you leave it, you will eventually return to it
(like that boyfriend/girlfriend you broke up with but after a couple of weeks you start thinking of again)
zutto nihongo to rabu rabu de iraremasu you ni