This is the 3405th most frequent Japanese word.
泣い
"泣い" is the stem form of the verb "泣く," meaning "to cry" or "to weep" in English.
In this context, '泣いてしまった' expresses an emotional reaction to the content of the movie, showing an involuntary action.
彼女は悲しい映画を見て泣いてしまった。
She ended up crying after watching a sad movie.
Here, '泣きました' conveys the action of crying due to an unsettling and uncomfortable situation of being lost.
子供は迷子になって泣きました。
The child cried after getting lost.
'涙を流しました' is a formal expression for crying, emphasizing the shedding of tears in a figurative or emotional moment.