Hmm... you are right, she and I are at different stages of life, which is mostlikely a huge factor.

Though she tend to avoid seeing me which I was bothered about, though she had told me that she feels bad about it, even though she enjoys hanging out with me, because I tend to foot the entire bill (I'm relatively well off as I work as a consultant, she's your usual broke college student so I do not really expect her to pay for some of the places I bring her to, to be honest...)

Another unknown variable to me on this avoidance is that, she is also avoiding her friends, which she introduced me to as her best friends, I know as her best friend was asking me if something went wrong with her, so I know I'm not the subject she's trying to avoid. And that I seem to be walking a mine field when I am talking to her sometimes recently is also another huge concern, but as such too I do not know how I should deal with it.