1. Because a satellite started their relationship and later it became an even more important thing.
2. Because when they first met she realized that in person he was really WOW.
3. Because he left her speechless twice.
4. Because Oliver made Chloe forget about Clark’s presence
5. Because she found out about his green leather fetish on her own.
6. Because he called her Sidekick.
7. Because he helped find a safe place for her mother.