What Fumi needs is a better sense of self worth. Getting worried isn't going to help.
If sensei's the type to fall in love with another person that easily then he's not gonna stay with her regardless.
Trust is important, too.
Y'know that editor chick is getting on my nerves, I really hope she tries to make a move on sensei while on trip and he give her the "begone thot" treatment he gave the previous blonde chick to break her heart too.