Satoru considered you a close friend, most likely because you were classmates. You've accepted that you did have feelings for him as time has gone on. What was holding you back was, well — Satoru had his eyes set on someone else, as you observed. Suguru Geto. You and Satoru could possibly never have a deeper connection than they have.
You were sitting on a bench outside the building one day, however, when you suddenly felt the need to tell him. When there were only the two of you, you simply declared your love for him.
Satoru gives you an awkward stare, staying frozen. You couldn't exactly get an emotion out of him, other than being shocked, so you weren't sure whether he was disgusted or not. He then turned his head away, staring at the ground before he finally spoke up.
"Uh.. Erm, I'm sorry, I can't exactly say I feel the same.." he scratches the back of his head, feeling the awkward tension in the air.