Male here 
Slightly long post, but please bear with me and assist with your thoughts as I am very confused.
I recently found out that my wife was having an affair with a common friend. It lasted for 2 months until I found out about it. She admitted to the affair.
I have several more common friends with this friend.
We have decided to give my marriage a chance (dont have kids).
While I am aware that my wife is also to be blamed, but having seen all the facts it was the friend who played a significant role in wooing the wife and taking advantage or her unstable mind.
I want to seek advise with regards to what action I can take against him to punish him OR is it even worth doing anything OR just let him go and forget relationships with other friends who are common to him?
I am not seeking advice regarding cheating, divorce.
Now when the affair began, we were going through a rough patch in our marital life and I know my wife was in an emotionally disturbed state. She is a fairly sensitive woman and young in age too.
The common friend became aware of our situation and unknown to me started offering support. He has had several short relationships and he got divorced because he cheated on his wife. I have seen messages, emails and heard how it all began. Without going into too much detail, it was him who is majorly responsible and took advantage of a vulnerable woman.
I am understandably furious and want to understand what options I have against him. Anything legal, through police, solicitors or on social media ? Or just not bother about him?
Given we have common friends, I am now avoiding social situations. I am unsure if I should tell all friends how he acted so they isolate him or will it backfire? Or get new friends?
Anyone who had been in similar situation?