Stop d relationship now.Let her go.It is like ur prayer has been answered.Don´t u read news papers or listen to news.One day she may kill u o.She is not good for u.forget her bros in ur own interest.

He can study any of the following courses
ISLAMIC STUDIES
ECONOMICS
YORUBA

I understand ur situation becos I have similar experience .For a man to come out openly on this issue is out of frustration.But many commentators on this issue do not understand the practical aspect of this issue.The reason ur wife gave u is d same reason my wife gave me.Some women are just like that no matter what.I am religious and my religion does not permit having girl friend.I lived with this for years with advice and counselling from elders for her to change.
One day,I concluded in my mind to have a second wife .
I told her .She welcome the decision.She did not bordered.
Although I have conluded to have a second wife but I have not gotten a reliable one becos I am selective.
But something happened one day a girl from where I work came to my house for an assignment.My wife saw her and she taught may be she is d second wife I said.Since then she has changed to some extent I did not expect.........Keep calm my brother........Be prayerful and apply wisdom........