This page is for the core question itself. Before you jump to conclusions, focus on repeated behavior, consistency, initiative, and follow-through rather than isolated chemistry.
Real interest is often less dramatic than people expect. It tends to show up as steadiness: repeated effort, consistent responsiveness, and willingness to move the connection forward in small but concrete ways.
Ask whether his behavior is making the situation clearer over time. Interest that stays ambiguous for too long often matters less than interest that becomes easier to recognize.
No article can tell you with certainty what someone feels internally. The useful goal is not certainty. It is better judgment: less projection, less over-reading, and better next-step decisions.