Context: Fujinomiya Neko 藤ノ宮寧子 changed schools to be in the same class as Makabe Masamune 真壁政宗, when his classmates tell him about it, he seems surprised, and Neko explains:
Masamune-sama wa {gozonjinai} hazu desu wa 政宗様はご存じないはずですわ Masamune-sama should {not know about [it]}. (literally.) I don't expect Masamune-sama to know about it.
{watakushi ga {katte ni} go-on wo kanjite-iru} dake desu kara...... わたくしが勝手にご恩を感じているだけですから･･････ Because [it] is just [that] {I felt [his] favor on my own}. (literally.) I just grew feelings for him on my own.
In other words, it's unrequited love: she started liking him by herself, and he was never informed about it.
