I had a friend who was super friendly and funny (extrovert personality type), was super athletic and fairly good looking when he didn't have a girlfriend. Then once he would get a girlfriend, he would do nothing, gain 50 lbs, and never hang out. Then his girlfriend would dump him. He would be super depressed, but eventually pull himself together. Go out, get active and be fun again. Snag another girlfriend, and the cycle would repeat.
For him, it all went back to this mommy abandonment issues since his mom had left the family for another woman when my friend was in Jr. High. He couldn't help but replay the "abandoned by woman" drama over and over.
The whole reason I tell this story is to demonstrate that many people have deep seated emotional/relationship issues that go back to their childhood relationships. They can be wonderful and likeable people, they can put on a great façade, but under the exterior they are broken and dysfunctional. That is not to say that you can't have deep sympathy for them, but they simply are aren't relationship material, and you can't do anything to fix them. Don't be a fool. Until this woman you are dating knows how to handle her life, you are just ruining your own life by being preoccupied with her.