Hi bepleased; I am glad that you have discovered the metaphor.. The metaphor can be an effective literary device, but must be used with care. Rock has often been used in literature as a reference to stability, strength, and protection.
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bepleasedAs your saying,"His marriage is on the rocks."The picture of the mind of speaker is that the rocks acts as a bear at the bottom of the sentence.So, His marriage is supported by the rocks.Now there is your conundrum
bepleasedThe "on" used to show "support" and "towards".Not always.
bepleasedI am confused with the same of "in the mind" in the definition of "confuse"[confuse]-----to cause to be mixed up "in the mind"Could you give an explanation to it?The lady is confused because she does not know which way to go.