Well, you can have yourself a nice little pity party, or you can start improving you.
The purpose of proof is so that you don't finish off what is left of your marriage by a false accusation.
Now that you are sure about the affair, it is time to bring the affair to the light of day. Exposure of an affair takes away the 'fantasy' part of the illicit relationship and brings its true character to the light of day. Since affairs are based on deception, fantasy and lies, they tend to look pretty ugly when viewed in good strong light. The way to shine light on an affair is by exposure.
Does her family know? They need too.
There is nothing loving or beautiful about an affair. Look at what it is doing to the other man's marriage, wife, kids. Look at what it is doing to you.
You are going to have to decide if you are wanting to fight for your marriage, or if you just want to work on you and coast. If you want to fight for it, I warn you, it may get ugly before or if it gets better.
If you would rather coast, I must warn you that, rather than being a participant, you are being a passenger.
Regardless of what you choose, you are going to face pain.
-NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.