The phrase "break heart" has a negative connotation and describes the feeling of deep emotional pain or sorrow. There are several antonyms for this phrase that have a more positive or neutral meaning. The first is "heal heart," which signifies a process of mending emotional wounds and finding inner peace. Another antonym could be "inspire heart," which refers to the feeling of being motivated or moved by something positive. "Mend heart" is another antonym that implies the act of repairing a relationship or resolving a conflict. Finally, "joyful heart" suggests happiness and contentment, which is the opposite of feeling heartbroken.