Sweet as in bittersweet
Hercules Poirot often says something like it. Agatha Christie novels often have unattached detectives like Poirot and Miss Marple working to bring young lovers together while solving the murder.
It’s a very uncle/aunt type sentiment so you’re aging yourself 
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Oh not that way. As in the unsolved murder creating barriers preventing couple from being together so a reason to solve it.
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