But before you hit that Alter and the preacher start pronouncin' (uh-huh)
Gave her half your heart but she got half of your amount (oh yeah)
Of whatever's in your account
So take that into account

from Big Sean – Crazy Lyrics on Rap Genius

Before getting married, Sean says that you’ve given her half your heart to mean that you’re in love. When that happens, she’ll be taking half of what you own by way of a prenuptial agreement.

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