Friend who like his friend

I have a friend who like his friend.. er mean his girl friend. when they were friends, i saw that, the way they laugh, the way they "ketuk kepala" their partner, he pulled her hair, she "sepak" his face, etc, all that "pukul-pukul" stuffs seems normal. but when this one word call "love" arrived in their life, things change.

[musique on air] Shizuka - Redline