Fear is a very understandable emotion. Every relationship is unique, and this is very early on for both of you. My thought, based on what I'd do over, is to focus on meeting her needs, emotionally and otherwise, and keep talking, but try to keep her expressing and understanding her feelings, fears and concerns, rather than explaining yours. And don't engage in bargaining or negotiating... Now is the time to convince her that you are ultimately and unconditionally committed to her happiness and fulfillment. Of course, you'll hope she can make the same unconditional commitment to you, but that may take some time...or it may never come. But, as you said, giving up your relationship will be a net negative...so act accordingly.
