This quote conveys the idea that quality far outweighs quantity in matters of love and attention. "A million men giving you attention" represents a scenario where many people may be interested in or attracted to you. However, the quote suggests that this attention pales in comparison to "that one man giving you all of his."
The emphasis here is on the depth and sincerity of a single person's commitment and devotion. "All of his" signifies a level of dedication and exclusivity that surpasses the superficiality of fleeting attention from many. It underlines the value of a deep and meaningful connection with one person over superficial or fleeting interactions with many.
In essence, the quote promotes the importance of genuine, committed, and exclusive relationships. It encourages individuals to prioritize meaningful connections based on love, dedication, and undivided attention, suggesting that the quality of such a relationship surpasses any quantity of attention from others.