I told my girlfriend that the world is flat.
She said, "but the world is round."
I said, babe, you are my world.
Flat Earth Sweet Talk
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Explanation
The joke plays on the literal meaning of the earth being flat, but then shifts to the romantic meaning that the girlfriend is the speaker's entire world. It's a sweet and cheesy way to express affection, using the flat-earth idea as a setup for a loving line.