They had an admittedly complex relationship, especially because Vesper lied and cheated to fraternize with the enemy and put Bond's life on the line. As fans recall, Vesper, played by Eva Green, appeared in Casino Royale as the most notorious Bond girl (possibly until Agent Paloma) to act alongside Craig. During that time, he visits the grave of Vesper Lynd.
In No Time To Die's first act, Bond is in Matera, Italy, with his new love interest Madeleine Swann.
The film did a massive service to Daniel Craig's last outing as James Bond by mentioning a character from his first film.