My theory (just one possibility, im not saying its more probable than anything else):
She is "losing" something she said - maybe she's losing the feeling of BEING loved, not of loving you but your love is what seems to fade and consequently her emotions are flatlining when she's around you. However...
Quote:
I really want her!
So how do you fix a situation like that? What's the root of the problem?
Quote:
I was careful to not try and convince her that I was the right one, etc.
That is over analyzing right there! If you actually thought of that IN the situation, then I can see why she wouldnt feel loved by you - you're a million miles away in your PUA mindset. Of course it would have been a weak move to try and convince her of your qualities, but not because "it displays neediness" or something like that but because - assuming for a second that there was such a person - the "right one" wouldnt have to convince her that he is because with the right one she wouldnt doubt her relationship. Simple. BUT there is no such thing and things might work out and they might not depending on both your actions. It seems to me like the actual connection between you is somehow inhibited. If you're being distant towards her in any way at all then I'd say its that. Among other things probably but it could be the main problem.
Show her that you love her and open up! Think about the following: Are there things you always wanted to tell her, or have always played with the thought of telling her, but never did? Are there experiences you always wanted to share with her? Those kinds of things, things that happen solely inside our heads. Think about your relationship and about her in an intimate way (not sex, or, not just sex

, what does she mean to you, all that romantic bullshit.
And tell her. Contact her, ask her to meet somewhere alone, and at some point during conversation - better too early than too late - bring up some of the stuff that only you know/think/feel.
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Should i tell her i miss her?
One example of where you are way too careful, if the hypothetical Alpha Male (i suppose you've heard of him) missed a girl, would he tell her? Yes. Because he does whatever the fuck he feels like doing, never worried about consequences that are
beyond his control.
Develop a deeper connection by allowing her to get to know the real you, to enter your imaginary comfort zone.
So yeah, that
could be it, and either way following my advice can't do you any harm.