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W ith considerable tremor he read as follows: --
" W ill you forgive me, my dear friend, if I propose
a change of plan in the union of our families?

Word:

wives?" 

The word guess is "marriage".

Question:

Why the break up?

Answer (optional):

The passage does not provide a clear answer as to why there was a break up. No information is given about a break up or dissolution of any relationship.