Given how long she was able to lie about this, and your gut feeling throughout, I hope you realize that in all reality she has cheated you much more than she’s ever admitted. Even if she didn’t this is reason enough to reconsider, and if it was me, end the relationship.

Don’t buy into the sunken cost fallacy which it sounds like you’re potentially doing. It’s a hell of a lot easier to divorce at a year than ten years in. If you’re within 1 calendar year I think you can even file an annulment.