Up until that time, there was no information about Prince Harry breaking down after admitting "I don't know" multiple times in any publicized event.
Please keep in mind that news headlines can sometimes be sensationalized or taken out of context, so it's essential to verify information from credible and reliable sources before accepting it as fact.
If this event occurred , I recommend checking reputable news outlets for the most recent and accurate information about Prince Harry or any other topic of interest.