Jenna and Blake were in a car that was just about to leave the hospital. Blake felt compelled to tell Jenna what he knew about John. She felt sorry for Clara if she got John, or forced a relationship with him.
Meanwhile, Jenna, who doesn't know anything, finally feels she has to unite her best friend with John, thinking that their relationship is a balanced relationship. How could it be said to be balanced, if John actually had a relationship with Hellen.
However, wait! If Blake said that, it would only make Jenna think back to Ryan. Right. That would actually jeopardize his own marital relationship.
He didn't doubt Jenna. It's just, anything can happen. Moreover, Blake knew how memorable his wife's love story was with Ryan at that time. He wasn't going to let Jenna go back to Ryan. Will not.
"Uhm... honey, are you sure Doctor Armando has feelings for Clara?" Blake asked, starting the conversation.