话说唐朝时期，有个秀才名叫李白，他年轻有为，才华横溢，深受皇帝赏识。他娶了一位贤惠美丽的妻子，名叫王昭君。婚后，二人感情甚笃，夫唱妇随，羡煞旁人。然而，随着时间的推移，李白因公事长期在外奔波，与妻子聚少离多。而王昭君在家中，日日思念丈夫，内心寂寞难耐。一日，王昭君在自家后花园赏花，无意中看到一枝红杏探出墙外，娇艳欲滴，心中顿生无限感慨。她不禁想起丈夫远在千里之外，心中百感交集。这时，她一位年轻的表哥，前来探望她。二人在花园中相谈甚欢，渐渐地，他们之间萌生了暧昧的情愫。王昭君出墙的事很快在当地传开，李白知道后，内心悲痛万分。他无法接受妻子的背叛，最终选择与王昭君和离，独自一人隐居山林。此后，李白便将这段痛苦的经历，写进了自己的诗篇中。故事中，红杏出墙不再只是简单的自然现象，而是用来比喻夫妻感情破裂，一方不忠的象征。
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