We know that he broke things off with Nova before things got to that level (and just returned to work normally after that) so who is this girl he supposedly wanted to marry? And why would he get romantically entangled after walking away from his true love?
I am of the opinion that there is another story to tell, but it’s a matter of finding the right time to tell it. Grumpy, while beloved, is more of a minor character so squeezing another episode of his in, would have to fit with the overall major storyline/characters.
Hopefully you’re right and it’s not just an oversight. We can’t abide oversights.
//nails down some curtains
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"Nothing is easier than to denounce the evildoer; nothing is more difficult than to understand him."