Does Sakurai look just like
Ubukata from Tsurezure Children or is it just me?
Also: you shouldn't tell other guy "look for someone better" if you want him to stop making moves on your girlfriend. Isn't it a bit... humiliating towards your woman? Well, you can treat it as
My girlfriend is the best in the entire world, so when I tell you "look for someone better" I actually mean "I hope you'll never find a girlfriend since there is no one better than mine".
But this would be a stretch.