Is doing a marriage proposal prank on your girlfriend for an hour going too far?

I know marriages are declining but is doing a proposal prank about it going too far? I'm asking this because my friend (26 F) just dumped her now ex boyfriend after he did that prank. He supposedly copied a prank like that from a couple youtube videos.

Given my friend's reaction (earning him an immediate break-up, getting ghosted and then blocked), it wasn't funny at all. He was keeping a straight face for several moments and going along with the prank for nearly an hour. Once he saw her crying, he tried calming her down, saying he would one day propose for real but she broke up. Even if less men are into marriages, isn't that still cruel?

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+1 y
It was horrible. He even bought a fake ring to do the prank.
Is doing a marriage proposal prank on your girlfriend for an hour going too far?
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