Under what circumstances is it acceptable to date a friends ex?

My friend recently broke up with her now ex-boyfriend about a month ago. Her ex and I just recently admitted that we both have feelings for each other. Although I told him that we should just be friends I would love to be more than just that, except for the fear that I would be betraying my friend. My friend still... show more My friend recently broke up with her now ex-boyfriend about a month ago. Her ex and I just recently admitted that we both have feelings for each other. Although I told him that we should just be friends I would love to be more than just that, except for the fear that I would be betraying my friend. My friend still is not over him yet and they had a messy break up. Is there anyway this could ever work out?
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