It's that my mood change like these goddamn seasons
I'll fall for you,
With this line, Tyler elaborates on the idea of mood change. With a simile, he compares it to the changing seasons. This also might be a reference to Tyler’s use of colours to see his mood. Wolf is set in Summer, denoting the brighter, more jazzy feel to the album, and Goblin in Winter; hence the unstable feel to the music.
Here, Tyler’s feelings are constantly changing because they depend on the girl’s behavior, just like the seasons do.
Note: There is also a major play on words here: I’ll “fall” for you means falling in love, but ‘fall’ is also a season; Tyler’s mood changes when the girl is around.
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