What is your personal stance on dating a friends former crush?

We all have enough common sense to know not to date your friends ex. It’ll literally just ruin your friendship and goes against guy/girl code. However, what if they just used to be their crush? Obviously it might not be as major but at the same time it’s not like they were nobody to them either. Do you think it depends on how big of a crush they were? How would you personally feel yourself if your friend decided they wanted to date a former crush of yours?
What is your personal stance on dating a friends former crush?
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