What would u advice?

my boyfriend wants to buy a second hand car... am cool with his decision but i want him to stay in budget... he has no savings as of now... but he wants to buy a car way out of his budget that too pre owned... with 5 year loan i feel thats a waste... whenever we discuss i tell him to be in budget but he never agrees he wants to buy a car which interests him rather than a budget car for his need... what should i do... should i let him buy whatever he wants

What would u advice?
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