ÑÅÐÄÖÅ/ÄÓØÀ ÐÀÇÐÛÂÀÅÒÑß ÍÀ ×ÀÑÒÈ
[sertse/dusha razryvayetsa na chasti]
One's heart/soul is breaking into pieces.
One feels great pity, compassion, grief; one feels something keenly, takes something hard.
Cf. One's heart is breaking.