The Real World (1992) : 12x26

Arissa is broken up with Dario but continues to talk with him. He is her best friend and she still needs his support and the connection he brings to her old life. He also is putting on the full-court press to get back together with her and it's making her reconsider her decision. When Irulan's best friend Dina arrives in town, however, things change. Dina knows Dario from school and she has a secret. She informs Arissa that Dario slept with another woman and got her pregnant and then proceeded to parade Arissa around the other woman without Arissa knowing who she was. Arissa is heartbroken by the information and calls Dario to get his side of the story. When he denies everything she tells him that she's slept around on him as well and hangs up. The next day, Arissa confesses to Dina that she lied when she told Dario that she had slept with someone else. She's been faithful but she wanted him to hurt like she was hurting. Dina suggests that she tell him the truth and Arissa agrees.