Fred had sex with Julia, took care of her, found a job for her.
He probably likes Julia, he knows that she is fascinated by Monica, which results in his task for Monica in the office.
Fred could be a good character, but there are no positive characters in this game.
Edit:
I read your question again and I am not sure I understood you correctly.
Fred may or may not have sex with Julia, but it has any consequences for Monica's story. Betty can reject Fred's advances, but she will not become a good, faithful wife.