What should I do?

I’m 23M, turning 24 soon. With my birthday just around the corner, these thoughts have really been weighing on my mind. For the past few years, I had a hunch, but only recently did I get confirmation that the man who raised me—the man I’ve always known as my dad—is not my biological father.

​My dad has no idea. My mother finally confessed to me that my suspicions were right. However, my biological father does know that I am his son. I already know his name and where he lives.

​I really don't want the father who raised me to ever find out about this, because it would completely break him. At the same time, I can't shake the curiosity about who my biological father actually is as a person.

​I feel completely torn between wanting to protect the dad who raised me and wanting answers about my own origins. Has anyone been in a similar situation? What do you think I should do?