2) The whole sentiment of "I will calculate your love for me" is attached to a cluster of non-attractive features that probably get binned as "creepy". No, this isn't right. No, this isn't fair. But it is the case.

Quite sure HughRistik went over this, but the creepiness factor is pretty much the research of the whole routine flirting stuff that happens. Courting is the right word, I think.

But it's specifically that, though. Interestingly I think it's not uncommon for people to take a few actions, add them up and say "this person likes me". The opposite is quite true, too. The problem with those is that they're rather imprecise, so we can't know for sure. Unlike the research method which will recursively build upon itself until it has a good model. Precise vs imprecise, that's pretty damn creepy.