I guess it depends what you falling for,
Fallin for literally refers to falling in combat, but has an underlying meaning of what you’re falling for, or being deceived by. Kanye is asserting that people who are materialistic, and who chase things of no consequence are “falling for it”
This could also be interpreted as Kanye continuing on with his previous line. The art of war instructs us to hide our emotions and dispositions as people will see them as a weakness. Kanye sees some people may/do think that this is his plan with his woman, but he asserts that it really depends on what she actually loved (what she fell for), the clothes. In other words; sure, Kanye hiding his emotions might somehow make his girl feel like she’s being ignored and unloved and therefore fight for his affection. But this bitch is out buying clothes while he’s out with his side bitch. She doesn’t really give a shit what Ye is doing, she just loves the money.
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