Two possibilities:
1. There were serious relationship problems that weren't being addressed.
2. She's not wired to be faithful.
If 1, why weren't the problems being addressed? Was it something you realized but ignored, or something only she felt? Are these problems correctable?
If 2, do you really want to stay with her? If your relationship was going well and she cheated, how likely will it happen again if times are tough?
Is this fixable? Maybe. You have to ask yourself, though: do I want to fix it?
Edit: As Plan9n said, be open about everything. If you're going to fix it, you better not leave any emotion un-dealt with. Those will snow ball if not addressed.
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