After Rachel went to check on Quinn when babygate was revealed, Noah and herself had a, moment. She was leaving and he was going to Quinn but as they passed, he stopped her. He stared at her with guilt, but she was confused. If anything, he should hate her for what she did. She told Finn for selfish reasons that only benefited herself and ruined many people's lives.
She looked down, embarrassed, but he just kept staring until he finally spoke up.
"It wasn't your fault." he looked down, breaking his eye contact with her face. "It was all me. I got Quinn drunk, and then pregnant." He blamed everything on his own person, and she felt so bad.
"Noah, it wasn't all you. Takes two people to make a baby, I should know." and then left him in confusion about her previous statement. But then he went to his baby mama, since he needed to take care of her. Two people now relied on him, and he had to get his shit together, or he was fucked.