I don't know what it is about some people that sparks this RPF-adjacent obsession.
There are many artists where I'm a huge fan of their work, greatly enjoy everything they do, and do not care at all about their personal lives.
There are a few artists in the past where I got deeply invested in their private lives for a while, was hungry for any detail ... and then it faded after a while.
For example: If Wang Yibo and Xiao Zhan actually end up getting married next year (widely-held expectation among their fans), I'll be happy for them. And that's all. Which might sound like a fairly normal reaction to most people. But Chicken-from-2-years-ago would not believe that Chicken-now could be so uninterested in it.