Lizzie McGuire (2001)

Season 1: Episode 19

Lizzie and Miranda feel neglected, when Gordo spends more time with his new girlfriend, Brooke. They are unable to come to terms with the fact that Gordo has a girlfriend now and he is drifting away from their group. Meanwhile, Matt learns about "percentages" from his father and starts accepting bets from his friends, but he eventually lands in trouble when his mother finds out about this.