What is the meaning of the poem "despair" by samuel coleridge?

Coleridge was known for wallowing in the morbid. This is a very romantic (style) poem that we would almost call Goth or Emo these days. He is bemoaning the pain of life, itself, wondering if it's all worth it. The "Hostage' he refers to here could be read as a lover or as his love of nature, which was a central theme in his work. I like the ending, which is him describing an unspoken promise we all share with each other - that life is basically Hope and we've all entered into a promise (this League of Blood) to keep pretending that life is worth living. But he's threatening to break this pact and leave life behind. Very morbid, indeed. Reminds me very much of Hamlet's 'To be or not to be' speech.