I know what you mean, and I agree
But here's what I think; I think Katie is a lot more into you than she lets on, she's just been so guarded AND competitive at the same time, she says and does things to make herself seem confident and like she doesn't need anybody but could have anyone, but in truth all the compliments she receives from you really affects on her, because for one, she's not as confident as she lets you believe and two, they're coming from you
Remember, she and MC always were pretty damn close even as kids, Katie shows affection, in her own way, she can't let herself be too obvious about it of course because of her own insecurities, she can't let herself be vulnerable, and I think we've already started to crack down that wall of hers