変心 へんしん
henshin

Noun
Suru Verb

1. change of mind; inconstancy; apostasy

Intransitive
ぼく彼女 かのじょ突然 とつぜん変心 へんしんにとても おどろいた。
bokuwa kanojono totsuzenno henshinni totemo odoroita.
I was very much surprised by her sudden change of mind.