Man she became so in love with him that she become crazy, even erasing the memory that she is doing the game. I don't like drama but this is a bittersweet savor that we need in this manga, this can't be only happiness.
Well we don't know anything about the relationship between his sister and boyfriend, maybe it is a good relationship and she got pregnant. Boyfriend just needed to do the wedding sooner, it doesn't necessary means that boyfriend is a dick or anything.
Well she told him this late about her kid, a big kid and she is talking about moving together already in the same day, and the guy seems cool about it, he is a nice guy. (I hope)
Everybody is disappointed that mc didn't kill the prince, I'm more disappointed in ms. kinght overlooking what the prince does, she looked like a honorable character.