<human>: Give me the gist of the text in a nutshell

I'm on mobile so sorry in advance.

My wife and I met in college, we were in the same freshman biology class, and group partners. I was in a relationship that ended around Christmas break and my now wife started talking to me.

We hit it off and started dating during out sophomore year during the second semester. We were super happy the whole time we were dating and I proposed to her after we graduated.

We got married and she found a great nursing job in the city I went to graduate school in, we were really happy.

I got my doctorate and got a wonderful job in the ER at the hospital in the city we were living in. This whole time we were trying to have a kid.

5 years ago, my wife became pregnant when I was two years from being done with my doctorate, I was so happy because we were trying to have a kid.

Anyways, I love my son so much but about a month ago, one of my wife's friends told me my son might not be mine, and I should ask my wife.

Anyways, I decided to get a paternity test and I found out that I am not the father of my son. I will still love him as if he was mine, I just don't know what to do. I am so hurt and confused. Any help would be greatly appreciated.
<bot>: Found out the child I have been raising isn't really my biological child, and that means my wife cheated on me. I don't know where to go from here. Please help