Diego and Liz were together while Liz worked on a research project in Denver, Colorado. After the funding was cut and her research ended, Liz realized that she was in love with the work and not with Diego. She packed up and left abruptly without telling him.
Liz later tells Maria that she left her fiance in Denver three weeks earlier.
Max later asks Liz about the worse thing she's ever done, and she tells him about leaving Diego.
Linger: Anger's not so bad. It reminds us something's not right and then we change it. And you are going to change everything. I'm so glad I get to stand beside you when I do.
Diego appears in the following episodes:
|Roswell, New Mexico||1||2||3||4||5||6||7||8||9||10||11||12||13|
|Season 1 episodes|
|Season 2 episodes||✔||✔||✔||✔|