I have been looking for a year.

No one knows. This site is one my last chances:

I believe it to be a French movie.

Between 1990 and 2005.

Its about a teen boy and girl. Criminal they rob someone and flee the city.

Get into the woods and get kidnapped.

Girl is put in basement. Boy becomes a (sex) slave for the huge male hunter.

Finally they escape but the boy seems to have developed affection for their kidnapper (stockholm syndrome).

Police shooting in field at the end.

Very sad psychological art drama.