Eat your heart out

指妒忌或羡慕别人。

I'm going to New York next week. Eat your heart out!

我下周就要去纽约了。你就嫉妒吧！

When he hears about your promotion he'll eat his heart out.

他要是听到你升职的消息，肯定羡慕得不得了。

Follow your heart

跟从内心，做你自己认为正确的事情。

I think you should follow your heart and move to Chicago.

我觉得你应该遵从自己的意愿，搬到芝加哥去。

She said she had to follow her heart and marry Peter, even if her parents didn't approve.

她说，她得遵从自己的意愿嫁给皮特，尽管她的父母并不同意这门婚事。