Well hopefully the MC will have some balls and tell her to go fuck herself. She is in no position to lecture my character about anything. Followed by a steamy make up session
Honestly, I'm going to have to disagree on this one: she IS in a position to lecture him (*assuming* the MC insisted on no step back with her). What he did was profoundly stupid, and unlike Kaija he can't blame his poor decision making on Templar leadership. Following orders is hardly a perfect excuse, but it is AN excuse, and Kaija was under direct orders on what she could tell the MC. He went off on a potential suicide mission on a lark, without even leaving her a letter!
That's an astonishingly callous way to treat a woman he just reassured us all he (supposedly) cares about, all the more so because he won't stop bitching about his parents keeping him in the dark. Kaija absolutely should throw that back in his face. It by no means excuses her own failings, but she is well within her rights to expect better treatment from the MC if he wants to develop a serious relationship with her. Ideally this will be an opportunity for the two to figure out (on their own, free from outside interference) what they owe each other going forward.
Obviously if the MC wants to start over with Kaija this is not a real a problem, and if he told her to pound sand then his unannounced vacation is entirely consistent in that attitude towards her. I'm only talking about the Kaija-devotee path when I say she should give him an earful.