The first grown_up film that made me cry was a French film set during world war two called "forbidden games " ( can remember the French title) I was about 19 at the time

Its about a little girl whose parents get killed while they are fleeing a city.

She gets lost in the countryside, but a slightly older boy finds her and takes her to his home.
They become close friends , the little girl finds a dead bird one day , and makes a little cemeratary for it . She starts doing this every time she finds a dead animal as if she is mourning and greiveing for her parents .And if I remember correctly the boy starts killing animals for her , and they get into trouble , so much so that the boys parents call the authorities and the girl is taken away, and the final seen is the boy crying, and the girl on a train station crying out "michelle Michelle."