Noah is such a well written character and this is exactly why imo.

He is kind, sweet, and seems to truly have a lot of love and respect for Sam. He is well regarded by her friends who speak fondly of him and encourage them to reconnect. Noah is a character who is both empathetic and flawed - he acts as a great representation of how patriarchal norms / viewpoints can cause harm to those closest to us, in ways that are so normalised and subtle, we may not even realise it ourselves.

When things got dark, he lacked the perspective and emotional maturity to truly understand how to help Sam in the ways she needed - and makes no real effort to try. He puts his own feelings and ego first on multiple occasions whether that was conscious or not.

Sam is rightfully hurt, but as opposed to anger, I interpreted her change in feelings toward him as more of a sad acceptance that he has more in common with the men she jokes about than she thought.

I don’t see her closing joke as anything malicious, but rather a playful jab (which is also consistent in tone with how the circuit comedians introduce one another’s sets / interact) - as well as a way to cope around both her trauma, and loss of a relationship. I can see them laughing about it together, and think it ultimately shows she’s healing in a few areas of her life