How I Met Your Mother (2005)
S5E3 Robin 101
When Robin starts to worry that Barney might be cheating, she quickly finds out that he's actually been spending his nights with Ted, immersing himself in everything he can learn about dating her.
When Robin starts to worry that Barney might be cheating, she quickly finds out that he's actually been spending his nights with Ted, immersing himself in everything he can learn about dating her.