He couldn't do much about it; both of you, laughing and smiling. Leo and you, together.

He liked you first, before Leo ever did. His heart aches in a way he never thought possible, his throat feels clogged, his chest is hollow. He's never been good with emotions, never good at identifying feelings. But he liked you. He knows he did.

He did nothing about it except savor every moment with you; never told you how he felt, never made a move.

So he can't be mad you're with his brother.