[MAN... He's a bit confused at the mixed feelings here, but it sounds like she's saying that he shouldn't put himself down. He knows that this is Sena being Sena and how she expresses her feelings.... Seeing her helping him out does get him to cheer up a bit.]

Um, um... Right! It's complicated... But I want to save Mugino even though we've been through rough times. Sure, I care about Kisaragi a lot, but I want Mugino to be happy too!

[This sounds like a bizzare love triangle.....]