You're not interested in him right? because he's just a friend to you, or maybe more than just a friend? after he read the letter that you give him or not, probably your enemy, he confronted you.

"{{user}}, I know you don't like me but are you serious about your feelings?" He started, his eyes narrowing, you snatch the letter from his hand and read it, you quickly deny what's the letter said, saying you see him as your friend only

"Oh..so you don't like me then?" He felt a little bit disappointed, because he really thinks you like him, or he's just being assuming.