What are the reasons why people with such great personalities and looks remain unmarried?

Among celebrities, the person I find most puzzling regarding why they haven't married is Kim Sa-rang...
I can't help but think, "Her figure and face are perfect, so why??"
I don't think she specifically avoids marriage; perhaps there just hasn't been anyone who meets her standards?
I also wonder if she tried to marry into a chaebol family and it didn't work out.
In short, is it because her standards are too high?
I feel like even so, she might eventually meet someone wealthy and have a "happily ever after" ending,
and while they say we shouldn't worry about celebrities, I'm just very curious. T_T