Here is I post I wrote 13 years ago on my experiences in an adjacent area:
That may well be…but people thought they actually lived together IRL.
All I know is that I had a vague sense of relief when the actors playing brother-and-sister Dexter and Debra Morgan got divorced.
From that link on parasocial relationships:
Media users are loyal and feel directly connected to the persona, much as they are connected to their close friends, by observing and interpreting their appearance, gestures, voice, conversation, and conduct. Media personas have a significant amount of influence over media users, positive or negative, informing the way that they perceive certain topics or even their purchasing habits.
My feeling is that media relationships are no more than the modern outgrowth of relationships between people and a religious leader or a cult leader or, in earlier times, kings. Mass media may be a new and amplified version of this relationship, but humans have always been susceptible to taking the words of a charismatic individual and devoting one’s life to them.
Parasocial relationships do differ in certain important ways. Imaging that one is a friend of someone on media is a more equal relationship than being an acolyte, although both can feel guidance and support. Members of a cult also tend to feel powerful interrelationship with other members while parasocial relations sometimes devolve into personal jealousy of others who claim similar feelings. (That seems not to be true of Swifties, although I read of it happening with girls latching on to individual Beatles. Maybe girlfriend leads to a separate group than girl friend.)
So while not completely parallel, I think they both stem from common roots, the need to belong to larger sets of relationships than their personal lives can accommodate and the willingness to offer personal loyalty against outside scorn.
Right?! But geez, I had such mixed feelings about that. I loved them as a couple too. My brain got dizzy for awhile.
There’s a third option I’ve not seen mentioned: fantasy. People could just basically be pretending. Kinda like people at Disney pretend the suit performers are real.
It’s not uncommon in online discussion about fiction to talk about the characters like they are real. And there are several accounts out there which will do role play, pretending to be a character. And people will pretend they really are who they pretend to be.
It would make sense to me that, especially ore-internet, some people got this itch scratched by writing letters and such.
It’s OK. One was adopted, so no consanguinuity.
At least the internet documentaries I’ve seen on this topic suggest it’s all OK & just good clean fun if there’s a “step-” inserted somewhere amongst all the other inserting. 
Best thing that ever happened to Joanie.
This is crazy.
We all know Fred would be an awful husband.
Wilma was young and plenty hot. She had options. She stuck with Fred.
Therefore there’s gotta be something desirable in that big hunk o’ man. Evidently the women in the real world saw that too.
Inertia. Same as Alice and Ralph Kramden.
Please, tell me this is some kind of performance art or just a put-on.
How lucky that they happened to be filming it from the beginning!
Yeah, just an eminence front.
Ooo! A Who reference! Sweet!
I bought it.
But I won’t get fooled again.
mmm
did they have the name of it ? sounds different that the usual k drama
The Jim and Pam romance had wonderful chemistry. Some actors have it with their acting partner more than others.
I liked the chemistry also between Leah Remini and Kevin James.
Lots of people apparently thought James Garner was married to Mariette Hartley James Garner was such a great actor, everybody believed he was married to his commercial costar
Kinda like in post #2?