ADITU

ADVICE URGENTLY NEEDED.

I beg to hide my name, I am a man of 50 years old, my wife is 42, we have been married for 25 years , I am well educated and a business man doing well, my wife is a hairdresser, owing the best saloon in town.
After graduation. 26 years ago no job, I met my wife at a friend's engagement party, well exchange pleasantries, became friends, got engaged and married a year after.
My wife is an orphan,she inherited her parents property as the only child,we sold some of the properties and I used the proceeds to start business and today I am blessed.
We had one boy and two girls. In January this year my boy the 2nd born was sick ,it requires blood transfusion, I was told I can't donate for him our blood doesn't match.
One thing leads to another, out of curiosity I secretly demanded for DNA, it was NEGATIVE. He is not my boy. Less I forget, my business required me to travel for 4 months or more.
Since it's negative, I was forced to do it for my girls, first and last luckily it was negative.
I got confused. I haven't told my wife, if I divorce her for this reason I would lose my business because she is the reason behind my success.Who is the father of the boy? He later got a donor brought by my wife .He is well now and out of hospital.
WHAT SHOULD I DO?