That’s the thing, though. 99.99% of women do not show clear interest, even with guys they claim to like a lot. We have to interpret vague hints that are impossible to discern from mere friendliness. And then if we get it wrong, we are accused of harassment and misinterpreting being nice. Women want to play it both ways and so far, they have done that.
And no, this isn’t men’s fault. Be clearer and this would become far less of an issue.