* The anime and manga leave it open to interpretation: The series focuses more on the overall dynamics of the host club and the individual relationships within it. It doesn't explicitly state whether Tamaki and Haruhi are romantically in love.
* Tamaki's feelings are often ambiguous: He's deeply attached to Haruhi and sees her as special. His actions sometimes suggest romantic interest, like being jealous of other boys around her or trying to be her knight in shining armor. But his affection could also be interpreted as platonic love or familial love, given his "father" complex.
* Haruhi's feelings are more grounded: Haruhi is a practical and level-headed character. She values Tamaki's friendship and sees him as a close confidante. She's generally oblivious to romantic advances from anyone, including Tamaki.
Ultimately, the interpretation of their relationship is up to the viewer or reader. Some fans believe they are in love, while others see it as a strong friendship with potential for romantic development in the future.
It's important to note: The series explores various forms of love, including familial, platonic, and romantic, and it's up to the individual to decide how they perceive the relationship between Tamaki and Haruhi.