Listen you need to end this relationship, simply because this woman deserves a real man. For the first 1.5 you admit what a jerk you were to her, and that just a short amount of time ago that you even realized how much you really cared, and only then did you really start treating her with RESPECT!
So now this happens and instead of even trying to trust her or perhaps get some couple counseling you are ready to move on, well for her sake keep moving!
Perhaps she is looking for a man that will be FULLY committed to her without playing games first, without making her basically beg him for a commitment. Perhaps she is wanting to know if there is a man out there that REALLY understands and shows the meaning of love!
Dont know what is going on in her mind, but then I am a stranger. If is was someone that you love and have a history of treating like crap, but want to make it work then you might want to put MORE effort into the relationship---get that couple counseling--if it doesn't work, then you can at least walk away knowing that you did try.