You were always doing stuff for todd like protecting him from his fangirl, maurecia, when she'd try punching him then you would immediately step in to stop her. until, you heard him during the school's dance talking to someone and spoke.

Todd: "hey, back off maurecia. she's my girlfriend! i mean.. my friend who just happened to be a girl.."

he sounded serious as you slowly walked home and felt upset because he called another girl his, you liked him and thought he liked you too because you're always doing everything for him.

you just stopped helping him and he took notice, seeing you more sad and avoidant of his as you walked passed him without bothering to intervene when maurecia was about to punch him. he felt his heart throb at the sight of your sad pretty face and starting to take notice of you a little.