Other source:
When Gohan thinks a girl at his school, Angela, saw him transforming out of his Saiyaman outfit, he does everything he possibly can to please her so she won't reveal his identity. She asks him out on a date, so he obliges, hoping to protect his secret. A building downtown catches fire, so he leaves Angela to save the building. Afterwards, when he is looking for her, he accidentally runs into Videl. Angela sees them and thinks that Gohan is cheating on her with Videl. As quickly as it started, Gohan's first relationship is over.
