It looks like Ichika's really worried for Fuji. I guess since she's an heir to a hospital, she spent a lot of time with him.
I feel sorry for Fuji, the dude hasn't really been complimented his entire life. He's been bashed and badmouth, so the only thing he can think of to do is be bad. Because that's what he is, right?
But I think Mamori can see past his insecurities, and accept him for his flaws. It was not wrong for her to strike back against those badmouthing him. I'm glad that their pinky swear didn't go through yet. It means that Mamori still has the chance to defend Fuji!