nervous and scared

My wife and I have been separated for 4 months and 6 months last year. We have been married for 17 yrs. and have 2 wonderful children. We recently went to a medeator to start the process of divorce. (1 week ago) Her choice not mine. Over Easter weekend we started talking about things and she told me she wanted to work on our marriage and see a marriage counselor. I am very nevous and scared because she broke my heart twice already. I am not sure I can go through this a 3rd time. I do truley believ our marriage is worth it. I would love some advice on how to handle this. We get along very well and work well together with the kids. She just has some issues to work through. Thanks

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