DNA test..please No negative comments!!

Ma

I recently had a DNA test done for my son to find out which man was his father, There were 2 men we tested. We found out the 2nd man was his father..Now the 1st man was wanting to see proof, Because he thought he was and wanted to be But he wasn’t there my whole pregnancy, the actual Dad was..Do I have to prove him he isn’t..I’ve never been in a situation like this...🤷‍♀️