Translation: You are an egomaniac.
My good gentleperson, I do not see what sort of theory you used to claim egomania in this case. It certainly doesn't fit the APA defintion of egomania. But perhaps I am too ignorant to even begin claiming an objection to what seems to me both a misdiagnosis and a falsehood.
Finally, the answer to your question. Your predicament is NOT unique. She is a level headed person who wants to assert her individuality. You are a flaming asshole and a control freak. Pretty common, actually.
While your "honesty" seems genuinely founded on observation, I assert that is is inaccurate, at least.
Here is my take:
When one is in love, the experience and associated emotional states resulting from the relationship, the dynamics, the reciprocity, etc all contribute to the a transcendance of ego. HOWEVER. This is so out of the ordinary for most people. As Martin Buber claimed, you experience her "Thou" but that cannot be sustained on a daily basis.
Elledan has claimed here that neurobiologically, the serotonin produced is addictive. While his outlook and absolutist claims are amusing to read, he is correct in the fundamental schientific fact here.
Or to explain in psychological terms, you really love her. Thus, you would live to claim that for yoruself. Your ego has transcended but since so much of your experience is grounded in ego-ness, you don't know how to achieve that "oceanic feeling" except through objectification. To do that, you'd like to claim control. Claiming control compels you to want to spend more time with her.
She, on the other hand, is different. She either is not ready for complete commitment and wants to "discover herself" or is genuinely stifled by your advances and requires a reaction to compensate. Use the analogy of a ball in motion hitting a stationary ball hanging on a string. The stationary will move away but will come back, but then again move away and even compensate OVER the stationary position of the moving ball hits is again. Same sort of dynamic here.
Just think these things through and communicate what you're doing and why you are compelled to do something. If you want to build the relationship, you need just more than spending time. Healthy foundations are built with alot of effort and openness rather than "spending time together"
My advice is to gnosce te ipsum and to communicate.
Cheers !