burst one's bubble 打破幻想，让某人希望破灭，使之失望。
= to disappoint I don't mean to burst your bubble, ...这个句式也可以用上。

【例句】
News of the defeat quickly burst the bubble of our self-confidence.
失败的消息使我们的自信心迅速破灭了。

I don't mean to burst your bubble, but you're not the only one who got an award.
我不想让你幻灭，但其实你并不是唯一得奖的人。