Based on the fact that they probably had a much better relationship before she gained her status, I think she was severely influenced in a bad way by the status, but also the other nobility and that this breakup/heartbreak will definitely be a huge wakeup call. I hope they have a reunion and get back together, but only if it goes like this: MC becomes strong adventurer on his own, she resigns as a knight so she can search for him which is proof of how much she cares for him, they reunite, instead of her being condescending she is supportive, they adventure together and are a badass duo which is a force to be reckoned with and then get married and have strong little babies. I think that she probably took the friendly childhood friend teasing too far because of her jump in status and she didn't realize its effect on her beloved. I see some people saying that his self esteem kept getting lowered because of it to the point where it was too hard to say no or to confront her anymore, but he should have confronted her as soon as things started to go side ways and they could have had a talk and sorted things out before it escalated like it did. If that wasn't the case, then it said that he was able to rebuild his self esteem since he went on some solo adventures while she was busy. With that regained self esteem, he could have then been able to approach her to have a conversation with her about it. If she didn't fix herself after that, then, and only then, should he have broken up with her. He did not even give her a chance to become better and instead disappeared on her, leaving her in total despair. Since she was not given that second chance, if they are reunited, she should be able to have that second chance since she never got the chance to change or become better, and if I am being honest, like I said earlier, I believe this break up will end up being a huge wake up call to her and she will be able to change even before she talks with him again. So if you don't agree with me right now, that is fine, but if we are being realistic, in real life, if you had a childhood friend who you loved and who loved you and you started dating because you both loved each other deeply and you also had a great relationship that was very stable and going well, if the other person were to get a large jump in status such as becoming the CEO of amazon and becoming insanely famous and rich, if that person were to start treating you badly, because you knew who she was before all of that, you should talk to her about it so she can change, because someone who is not actually a bad person and simply just got influenced by a status change that was quite overwhelming, 99% they will realize their mistakes by just having a conversation about it with you. As I said, if you don't agree, that is fine, but at least don't act as if she was just straight up a bad person, realize the mistakes on both parties' sides (obviously she made the largest mistake) and consider what I have said. Because I truly do believe that the MC is meant to be with his childhood friend who is a good person, and just made a mistake due to the influence of the change and status and the influence of the more selfish people who she is surrounded by more often because of it.