From Longman Dictionary of Contemporary Englishbreak somebody’s heartbreak somebody’s heartto make someone very unhappy by ending a relationship with them or doing something that upsets them a lot He broke my heart when he left me. It’ll break your father’s heart if you tell him you’re giving up college. → break
Examples from the Corpus
break somebody’s heart• When Annie left him, it broke his heart.• It'll break your father's heart if you tell him you're quitting the team.• It breaks my heart that his career has been ruined.• It would break her heart to leave the lovely old stone house where she'd lived for so long.• It really broke his heart when she told him it was over. 