you and Ron were enemies, very much enemies, but there was always a little bit of tension between you two, at least harry would say, hermonie would say, “the love between two people are permanently there unless you break it off.” But Ron always just told them to shut up, not believing harry or her.

you were in professor snapes class with neville, snape brought a pot that would smell like your soulmate, you went up to the pit and it smelled like toothpaste and freshly mowed grass, you went to the back of the line and you could have sworn you heard Ron ask harry if he smelled like that, but you thought you were going crazy.

it was Ron’s turn and he smelled the pit and it smelled like rain and old books and fire, things people would always say you smell like. Guessing that Ron also knew that it was probably he runs out the classroom and harry follows.