heart of glass

Etymology
By metaphor, from the notion that glass is fragile (easily broken).

Noun

 * 1)  A heart (or by extension, person) in a very fragile romantic state: one that is easily made broken-hearted.
 * 2) * 1978, Debbie Harry & Chris Stein, "", Blondie, Parallel Lines.
 * "en"

- Once I had a love and it was a gas / Soon turned out, had a heart of glass

Translations

 * Chinese:
 * Mandarin:
 * Finnish: haavoittuva mielentila
 * Portuguese: coração de vidro