break (one's) heart
1. To betray, destroy, or abandon one's love, as by ending a romantic relationship. I know Adam broke your heart, but there are lots of guys out there who would treat you well. To think that she would cheat on Tom after 20 years of marriage. I can never forgive her for breaking his heart like that. You better not break my daughter's heart, sonny!
2. To cause one a feeling of intense sadness, regret, or pity. It really breaks my heart having to fire such talented employees, but there's no way the company will survive if I don't. That poor, skittish cat just breaks my heart—I can't believe someone abandoned her! No, I never drive by our old house. It breaks my heart to see the new family living there.
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