Ate heart out is an idiomatic expression used to describe a person who is feeling extreme jealousy or envy. It is often used in informal situations to convey a feeling of disappointment or frustration that one feels when someone else has something that they desire but cannot obtain. Antonyms for the Ate heart out could be the state of being content, satisfied or grateful for one's own blessings. Someone who is happy with their own life and achievements might not feel this kind of envy. However, if we consider another perspective, the antonyms could also be gloating or bragging when someone is trying to show off their success.