Radio Days - S1.E13

Stan decides to hire a new female talk show host and place her as co-host of Martin's show, to boost the station's ratings. At first Martin feels threatened by the move and is very stand-offish. But she soon warms him up with her charm, and Martin finds that he has become very attracted to her. Even though he loves Gina, he still feels a strong attraction to Monica, and tries to resist the temptation to be with her.