Fascinating how the brain and heart gravitate towards one tongue and not another. Like two people falling in love -- there's more than one reason they're called "living languages." And when you love learning a language, you can feel it loving you back. Yes you can!
After learning Japanese I tried Spanish. I love how it sounds and have listened to Spanish guitar music since childhood. I must have been a flamenco dancer in a past life.
I was sure Spanish would be easy after Japanese (reading and writing included). But it was like Sisyphus. Nothing stuck. I'd revisit a chapter the next day and it seemed to have been rewritten overnight. I knew when I was beaten. But I can't explain why.