A Merry Little Ex-Mas

Does the film portray affair triangles or just relationship triangles, including interlocking triangles? Where did Kate and Everett learn to start each statement with “I feel...”?

Kate Holden narrates: "... I danced at a party with a med student... We were obsessed with each other..." (0:00)

Mayor Christina tells waiter Buck, referring to Kate and Everett, "... They’re calling it conscious uncoupling."
Buck: “... They are consciously uncoupling.” 
Kate: ”... practicing total honesty...” (0:02)

Her neighbor April tells Kate, "I thought you two had a total honesty policy." 
April: ”... you are asking me to be selfless...” 
Kate: ”Duh. We have joint custody." 
Kate tells Everett’s father Mike’s husband Daryl, ”That’s so kind of you.” (0:03)

Kate and Everett’s daughter Sienna’s boyfriend Nigel: "Gryffindor."
Kate: ”Nigel works full-time as a Harry Potter tour guide.” 
Nigel: ”... I know Parseltongue...” 
Mike, referring to Everett: ”... he had a last minute patient.” (0:07)

Everett tells Kate, "I’m with a patient..." 
Kate: ”... when you’re not honest with me...” 
Everett: ”... I have been honest with you...” 
Kate: ”So you violated some kind of ethical laws and started dating her?” 
”... Well, thanks for being honest...” 
Patient August: ”... you tow consciously uncoupling.” (0:09)

Her neighbor Doris asks Kate, "You haven’t stalked her on socials?" 
Kate: ”I don’t wanna stalk her.” (0:11)

Everett’s lover Tess, referring to Sienna’s brother Gabriel: "The brave firefighter." 
Tess tells Nigel, ”... the Harry Potter expert...” (0:14)

Everett tell Kate, "... you’re worrying me... you’re stress baking..." (0:16)

Everett: "... I’ve always wanted to go nuts at Christmas." 
Tess asks Kate, "... out of curiosity...?" 
”... It’s really sweet...” 
”... stay focused... See all distractions as a derailment...” 
Kate: ”... I was dreaming...” 
Tess: ”... a bit like The Holiday...” 
Tess and Nigel: ”... Diagon Alley...” 
Nigel: ”Five points for Hufflepuff.” (0:18)

Santa tells Kate, "... He’s just very curious." (0:24)

Chet: "Crazy." (0:32)

Kate tells Everett, "Maybe if you weren’t so obsessed..." (0:33)

Everett tells Kate, "... You have so much more medical experience than I do." (0:36)

Kate tells Tess, "... You have nothing to worry about." (0:38)

Nigel tells Everett, "It’s Harry Potter." (0:38)

Tess tells Kate, "Everett’s smart and kind..." (0:39)

Chet: ”... Kate felt brave enough to share with me...” (0:40)

Mike tells Daryl, “... I don’t want you to pass out and smash your head..." 
Kate tells Mike, ”We drive each other crazy.” 
Mike: ”Daryl drives me crazy...” 
Referring to Sienna and Gabriel: ”... They’re hypnotized by shiny objects...” (0:41)

Sienna answers Kate, referring to Nigel, "... playing an online Quidditch match." 
”Silly...” 
Nigel: ”... I am Daniel Radcliffe.” (0:44)

Chet tells Daryl, ”... It's crazy” (0:45)

Kate asks Everett, "Am I dreaming?..." 
Everett: ”... I internalized that... turned me into a workaholic...” (0:49)

Mike tells Gabriel, "Son, you worry me." (0:50)

Everett tells Kate, "So this is your idea of total honesty." (0:53)

Gabriel tells Kate, "Yesterday you seemed deranged..." 
Nigel: ”As Aldus Dumbledore once said, ‘Harry...’” 
Kate tells Nigel, ”... That’s very kind.” (0:55)

Chet tells Kate, "... It’s a nightmare." 
April tells Kate, ”... You don’t look drunk." (0:56)

Tess: "... I pride myself..." (1:02)

Kate tells Tess, “... Everett and I need to work on our boundaries.” 
Tess: ”... magical boundaries...?...” (1:10)

Tess tells Everett, "... I also hit my head... some sort of manic episode..." (1:11)

Kate tells Sienna, "I’m so proud of you..." (1:13)

Nigel tells Kate, "... That’s old habits..." 
Kate: ”You’re very sweet, Nigel. Thank you for being kind to my daughter. You’re... a little crazy.” (1:16)

Everett tells Kate, "... we have failed at consciously uncoupling." (1:22)