Wow, the sister is an asshole.

"I have a lover in university, I leave them, and my sister, to make merry in a foreign country, meet some stud there and decide to marry him"

Talk about being selfish and insensitive.

Eh... well don't wanna make a point of invalidating your views or anything, but pretty sure that isn't how it went down, unless the author has other intentions which would be clarified later? She just gotta move due to work, and since from her pov, her sister wanted to gain independence so she left home, that wouldn't be her abandoning anyone. Then she met someone she can love.

Like, idk. Hope whoever hurt you gets their karma I guess?