In Jonathan Safran Foer's "Extremely Loud and Incredibly Close," the deep emotional connection between the characters reveals themes of love and sacrifice. The quote "I would have done anything for him. Maybe that was my sickness" underscores the extent of devotion one can feel for another, suggesting that such unwavering dedication may lead to unhealthy attachments. This reflects the protagonist's yearning to support and protect loved ones, even at a personal cost.

The notion of love as a potential sickness highlights the complexity of relationships, where loyalty can blur the lines between care and self-neglect. The character grapples with the implications of their devotion, implying that extreme emotional investments can lead to both strength and vulnerability. This duality resonates throughout the narrative, as characters navigate their profound connections amidst grief and longing.