What do I do if I just found out I'm the product of cuckoldry?

I found out yesterday (I'm 28) that my "father" asked my mother to get pregnant and encouraged her to find another partner so he could raise another man's child. My "father" died when I was 19 and never met my biological father. My "father" left everything to me including his business.

Now that I know I'm a bastard son, I don't know what to do with my life anymore.