I see the lyrics as describing a state of entrapment in total grief from a previous broken relationship. - "In this tomb I call love, I get so lonesome with you". Upon this discovery of a new love, which the person seems to have deemed impossible, they are prepared to leave their state of mourning for their lost love. When they rise (to this new love), they will leave the past (and their mournful love for the past relationship) to die.
I see the lyrics as describing a state of entrapment in total grief from a previous broken relationship. - "In this tomb I call love, I get so lonesome with you". Upon this discovery of a new love, which the person seems to have deemed impossible, they are prepared to leave their state of mourning for their lost love. When they rise (to this new love), they will leave the past (and their mournful love for the past relationship) to die.