David's relationship with Javi is mixed. Through flashbacks, it is shown they got into many fights and disagreements. When Javi arrives after their father's death, David is angered at him and gets into a physical fight with him. David tries to make it clear he still loves Javi. Unbeknownst to David, when he reunites with his family, Javi and Kate have become very close while he was gone, and can even enter a relationship (Determinant). Eventually when it is revealed that they are/were in a relationship, David completely loses it and attacks Javi. Javi has a choice whether to fight back or show love to David, keeping a promise he made to their father to look out for David.