It wasn't quite obvious from the start..

You mean his affection for you.

After all, Scaramouche was quite cold towards everyone and even though the two of you were best friends, he still seemed to distance himself from you.

You were in school and he saw some of his classmates nearby and said that he'll go talk to them.

"See you later, I love you."

His words left you speechless for a moment, but his expression was priceless. He just realised what he had said..