I think, too, that Galadriel and Celebrimbor are pretty angry with one another for the Mairen situation and for other reasons. She s not happy that he brings up loving her, even if he isn’t really referring to the romantic love he has felt for her but rather a deep and close bond between kin and friends and if he’s primarily regretting the circumstances that lead them to this point.
He’s not thrilled that she seems to suggest he didn’t love her enough, when he feels by and large that he’s been very good about the whole unrequited thing (only bringing it up awkwardly and dramatically two or three times - ;-) ) and when he feels he has the opportunity of an new and different beginning, though what that beginning entails is far from clear, and doesn’t understand why she might begrudge him that. (She doesn’t. Just bad idea, man.)