Here's why:
* The series never explicitly shows them kissing. While there are scenes where they share close moments, it's left to interpretation.
* The focus is on their friendship and the Digimon adventure. The series emphasizes their strong bond and the importance of teamwork.
* The creators have not officially confirmed a romantic relationship. Though there are hints and subtle interactions, they've kept it open to the audience's interpretation.
Ultimately, whether or not you believe Ryo and Rika share romantic feelings is up to you. The series leaves it open for fans to interpret their relationship in different ways.