Hi, welcome to SI, the best club no one wants to join. I am sorry you are now a member of this group that was brought together because their spouse/SO had an affair or multiple affairs.
Have you ever thought about asking your wife to take a polygraph? You know of two affairs, the poly might force her to come clean about everything. Unfortunately, most waywards don't admit to too much unless we throw solid evidence at them....and sometimes, even then, they deny.
Is your wife doing anything to repair the damage she has done....counseling, reading books, giving you access to all of her social media including phone, email, facebook, linkedin, etc.
Accountability for her whereabouts at all times.
Cheaters lie and lie and lie by omission. They either try to protect themselves, minimize the situation, don't want to hurt the BS, or possibly sweep the A under the rug.
Only you know what is best for you. I suggest you meet with an attorney, not to file, but as a consultation to help you understand your rights if you go the D route.
You WILL get through this, take one day at a time, take time for yourself doing things you enjoy doing...walks, runs, fishing, golfing, anything to give you some peace within this mess.