So pretty much, the Admiral said something that could be interpreted as a proposal-esque speech on the last page.(Something like I wouldn't cheat on you or being together.) And in the first two frames is her "Oh shi-t"ing at that. But then she realizes that since Inazuma didn't have the proper grasp over marriage in the first place, she thinks that the love is one-sided (Or lit. "It was a one-sided thought.")