They've known each other since kindergarten - 'the boy came riding a bamboo horse, circling the bed playing with green plums.'
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history
From 《长干行》 by 李白 (Tang dynasty): 郎骑竹马来，绕床弄青梅. The couplet is the origin of the Chinese term 青梅竹马 for childhood sweethearts.
usage
床 in Tang-era poetry often meant 'a couch / a well railing / a frame,' not a modern bed, hence 'circled the couch.' Scholarly debate continues, but 井栏 ('well railing') is the leading modern reading.
