I'm having Costia and Lexa feels so here I am. When Costia's first boyfriend/girlfriend breaks up with her she skips school and goes to the mall. Lexa just so happens to be shopping and sees Costia at the food court just sitting there. Lexa approaches and asks why she's not in school but Costia doesn't answer. Lexa realizes Costia is upset so she wordlessly buys her nachos and the two go see movies for the rest of the afternoon. It's only later that Lexa hears from Clarke about the break up.