Homework: What can you say about the cause of their divorce?

I think the emotional dispute  is the main cause of their divorce.= I think the main cause of their divorce is misunderstanding. 
I think many couples who are about to divorce have similar reasons like them, feeling hurt from their partners at the beginning of the quarrel. = fight. 
A marriage  =  Marriage life is made from two individuals = for couples who have very different characters and thoughts, = different personalities or attitudes, so it cannot avoid to quarrel. = so fighting, misunderstanding etc. are part of marriage life and it's inevitable. 
However, if they are both adult, = If they are matured enough they should try to get over with the problem whatever it is. = whatever problem it is. 
I think this is the = it's their responsibility about marriage and a true respect for partner. = to take good care of their marriage by showing respect and love for each other.