In need of opinions

Brittany • I have a wonder little boy born September 23, 2014.
Me and the boyfriend of two years has a 8 month old son. Well seems like Everytime my son crys for what seem like no reason the bf gets pissed off and yells at him to stop. Well he's only right months ok so pretty sure he doesn't understand what's going on. Well he just put him in his crib and let's him cry. Well crying turns to screaming and nothing gets any better. So I go and hold him and calm him down and put him to sleep. Then I'm in the wrong for babying our son. Need options.