This gesture underscores the immediate and deep emotional connection between the two characters, as Nick trusts a woman he has just met with the most important aspects of his life.
See the first meeting between Meredith and Nick Marsh that led to this moment of trust: [S14E17] One Day Like This
As Nick recovers from a post-transplant complication, he becomes fearful of his own mortality. He gives Meredith a paper containing: The . This gesture underscores the immediate and deep emotional
Specific , whom he raised and has custody over. [S14E17] One Day Like This