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rydeto, I know that you are in difficult situation now, my question is, did your wife asked you a forgiveness ? If she asked you, are you ready to forgive her ? do you still love her ? .. If the answer is yes, then move on and forget everything happened. .
I'm not a lawyer but if you want to file a case against her, I think its difficult because you don't have evidence, and the process will take time, it will give you more misery than peace.
For me it is better to walk in separate ways and strive hard to fulfill my duty as a father and focus to my son. . . And most of all Pray to God to guide you specially in this difficult time.