Am I what she wants, or am I just kidding myself?

I have known this girl for over 3 years now. We dated for about 2 years, and have a good relationship. We both agree that it was wonderful, and that we had really good sex, the whole deal. She broke up with me because she was afraid of commitment. She admits this, and also admits that she feels like she dismissed me too easily. We have had an up and down relationship latley. Since we broke up, however, she has been seeing this guy. She lives in a different state, so I kind of had to accept things. Recently she came up to see me, and we had a GREAT time. Now she is back home. She is confussed on what she should do. She tells me that she is concerned with out sexual chemistry. She admits we used to have 10 sex (on a scale of 1-10) but now she feels it's more like "7". With this other guy, it's more like "9". She is afraid we can never get back to the same chemistry we had. She does love me, but can't help being who she is. We only had a short time to establish our sexual chemistry, and we had a lot of inhibitions (obviously) during that time. I am not suprised the sex is not as good as it was. Should I even care though? Am I wasting my time with her? She is confussed right now, deciding whether or not she is going to continue her relationship with this other guy, or give it up to persue what we have. We both feel good about what we have, and she says she feels like she can't live without me. Any advice?