On a trip to Canada him and mia fake them dating each other to get Miguel and Roberta jealous. It seems as though making each other jealous worked, because they ended the trip with a passionate kiss. Diego often shows that when he has problems, he tends to drink a lot, almost dying. He also shows that he is highly affected by the problems that surround his parents marriage. Towards the end of the first season, Diego falls, hitting his head, and pretends not to remember Roberta so that he can go out with her and win the bet he made with Tomas. He starts to fall in love with her but when Roberta finds out why he went out with her she dumps him. He's crushed and tries to get her back. In the second season he wins the Student Body President elections because his team cheats and then shares the presidency with Roberta. He tries to get Roberta jealous in numerous occasions, with numerous girls including Sol and Lola, although he doesn't really last that long with any of them. In the third season, RBD start recording their album and go on tour. While on their way back Diego confesses his love for Roberta, because he thinks that the plane is going to crash and he's going to die. Roberta does the same. When the plane lands and they get off, he tells her that he was just kidding. However, later on he realizes that he really is in love and asks her to be his girlfriend, but she says no. After saving her and doing sweet things like giving her serenades, she finally decides to take a chance and they date. They break up later, because Roberta thinks that he is back to his old ways.