I hate to bring you back to ground.
I hate to bring you back to reality.
The reason your phrase is used is because it is quite general. There are many ways to rephrase it depending on what sort of 'bubble' they are in.
2019年11月11日
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@Proshanto - 'she/ he is in illusions' doesn't make sense.
2019年11月11日
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"i hate to give you bad news, but..."
2019年11月11日
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burst someone's bubble= shatter someone's illusions about something or destroy their sense of well-being. so just tell him/her that she/ he is in illusions!