Is it weird to buy your own promise ring?

My boyfriend really wants to get us engraved promise rings, but unfortunately doesn't have enough money to do so. I would love to get us some, but I'm afraid it might be considered weird. If I were to buy them myself, no one would have to know I was the one who bought them. Although it really shouldn't be a big deal in the first place šŸ¤·šŸ½ā€ā™€ļø

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