Matthew Collins is the female protagonist's high school crush from Silent Hill: Book of Memories; however he ended up dating a fellow student named Ashley Baker. His sister is Katie Collins. He is the Wood Guardian (Katie is the Wood Guardian is the protagonist is male).
During the events of Silent Hill: Book of Memories, the protagonist was able to change history so that Matthew dumped Ashley and instead formed a relationship with the protagonist.
Matthew is the one whom ends up being the protagonist's crush if the main character is female. While he was friends with the main character, she harbored a huge crush on him.
He ends up being with Ashley Baker when the main character bumps into him later on in the game, but he later breaks up with Ashley after her spoiled and vain nature ruined their relationship.