just watched for the first time, funny, relatable
First, the obvious, it feels realistic because it doesn't seem overly sanitized.
Nadine, I get and I don't. Your brother and best friend like each other, they're happy, they're treating each other well, it doesn't have any bearing on your romantic life, it's not like she stole Nadine's love interest, so be happy for them and go with it. On the other hand, I get that sometimes you think you know best and need to squash it.