i think this is about not a relationship
but a friendship
he realises that his friend has done something
or found something that could tear them apart
and that "sinking ship" is (i think) a metaphor for something he tryed to hide but his friend may have found a way to get it
i think this is about not a relationship but a friendship he realises that his friend has done something or found something that could tear them apart and that "sinking ship" is (i think) a metaphor for something he tryed to hide but his friend may have found a way to get it