Dear Mr Seeker (I've deliberately left out the word in
front),
You're probably thinking too much & reading too much into what
she's saying, etc? She's probably taking her time to decide between
the 2 of you, & frankly, I'm Not gonna judge whether that's
wrong or Not, unless there's deliberate manipulation on her part.
Frankly, this is called playing the field, & it's pretty
common... However, I don't really get the "Not sincere enough"
remark, perhaps she's trying to spur you on to make you give her
even more attention. Personally, I don't practise such tactics, as
it only spurs the guy on to super-human efforts, but when he can't
maintain that effort, it'll only lead to disappointment
later.
My own experience is that my guy friends who're suckered into this
kinda thing, eventually find that they can't stomach the loss of
the girl (i.e. she decides on another guy). Their main lament? "But
I've invested so much time, effort, etc in her" plus what's
implicit, "I really NEED to have her, or my money back" 
I think by now you should get the gist of what I'm trying to tell
you, very gently. If you choose to heed it, good on you. If you
choose Not to, please know that I won't waste time on people who
won't help themselves. I've had people PM me, ignore my advice,
then come crying back to me, hoping for me to say something
encouraging. Most of the time, I can't do anything more than
that.
If you choose to persist in your efforts to pursue her, I would
seriously advise you to still mentally prepare yourself for the
fact that at the end of the day, you might Not even be her choice.
At least mentally & emotionally prepare yourself. If she
chooses you, then good on you.
Good luck!
FeowFeow
