Sorry to break it to you, Komachi, but that didn't work that way. It doesn't matter how long you loved him. What matter is how long you spend your precious time with him. You only watched him from afar and didn't do anything until late in the game. So, your approach didn't affect much because Eiji already spend his precious time with Nanako and both of them really enjoy it. To be honest, your presence, Komachi, didn't do much change in Eiji. Both Eiji and Nanako is truly made for each other and it's already final. Nothing gonna change it.