Girl: "When we get married, I want to share all your worries, troubles, and lighten your burden."
Boy: "It's very kind of you, darling, but I don't have any worries or troubles."
Girl: "Well, that's because we aren't married yet!"
Pre-Marriage Bliss
Explanation
Explain Bear
Hey, chucklehead! Explain Bear here. The girl says she wants to share all the dude's worries AFTER they get hitched. But the punchline is that the dude doesn't have worries YET... because he hasn't made the mistake of marrying her, you dummy!