My grandmother did this and honestly I hated it. I'm cis and still felt so uncomfortable that I asked not to see her. Preschool and up every time she pinched my cheeks and asked if I had girlfriend and it went on and on, do you want to call her, what is she like, I bet you're so cute.
I did not, in fact, have a girlfriend.
I still remember that grandma. I'm in my 30s and I remember hating that.
I guess because it's seen as hitting a developmental milestone. Still creepy, though. I'm fortunate in that literally none of my family would ever pry about partners nor kids.