This is so sad..! This guy is such a dirtbag, even though he's pretty much the same as any ol' average joe. Yukako deserves so much better- this is why we shouldn't marry too soon...! Someone -Not saying the current partner isn't "great" or compatible- but, someone else may be even better out there. You just don't know!
...until you go to your homecoming party and realize your mistakes :(