To be 'jaded' = to lose the will to live
Someone (generally a Woman) who is Worn out, wearied, exhausted or lacking enthusiasm, due to age or experience. From "jade" a worn out horse
dulled by surfeit exhausted (Example: "The amoral, jaded, bored upper classes")
Someone is considered "jaded" when they think they have seen and done it all, and they act bored and unexcited at whatever is happening around them.
A person with a jaded heart believes there is no such thing as love. They will use others for their own pleasure not caring how it may hurt the person.