This has become a very bizarre conversation. IF these were real people [a whole bunch of random ethical/moralizing about what’s OK, not OK, what any given reader would or would not do, would or would not accept, etc., etc., etc.]
In the event, however, these are, unless I am greatly deluded about the nature of real people, NOT real people, and they do not exist except as we see them in the panels. Therefore we are expected, as is normal when reading fiction, to triangulate among real-life norms, general narrative conventions, and the implicit and explicit premises created by the individual storyworld.
The proposition that, “One day you act deeply in love, the next day (a highly significant ceremonial day, by the way) you blow your lover off, and that’s fine because life,” is . . . of limited relevance to the topic at hand.