The ending is pretty simple, you don't have to think about it that much. It implies they still love each other no matter what, but it was poorly executed to mimic a generic NTR H-doujin cuck ending. Probably for the "comedy" part... And of course it back fired massively!
This and that happened in the time skip, doesn't matter at all! You know they didn't do shit since we already established the fact that her writing is dog shit, and doesn't acknowledge that any real time passed... Amateur work at it finest.
So with this post i'm pretty much done with this garbage. I'll still be around for some time to see if any KA drama happens, but theory crafting is over for me. Oh, and my rating will stay 1/10... If i could give it lower, i would lol