Actually, since they mentioned the story before I think something is wrong, because if the fairy continues to recriminate, most likely her feeling does too more like the saying history repeats it self, so the current Diane would fall again with a magician, but the fact that the current Diane is in love with Bazel, might be in the past, she did love him but had to do something for him, like sacrificing herself or whatever! Or at least that’s what I hope for!
The only other thing I can think of is that the rumors that the fairy and the magician being together were false made up as myth and legend (the evidence being that it wasn't the magician that pulled her out of the water but the knight) and that some sacrifice was made that he is afraid will happen again!
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I have this anxiety reading this flashback from Margrave's point of view bc I know that eventually the fricking blonde magician Helios is going to steal Dian (original fairy goddess, not current mc) from Bazel and it will literally break my heart esp since it somehow ends with her dying and I'M NOT READY FOR IT!!! Want it to go back to the main plot please bc I can see too many similiaries between the current Dian and past fairy goddess Dian(a) and it hits me right in the feelings ╥﹏╥