From my point of view of a relationship specifically between couple, when the man act nicely and kindly and show love to his woman, he approves to her that he is a good man, however, after marriage, perhaps after few months, gradually his bad habits and behaviors appeared e.g. short-tempered, he gets nervous if the food is not prepared, if his things got lost, if he had a bad work day etc. not all men like this but this is one point that may lead to arguments and in worse situations to breaking up the relationship. Another thing, if the man had secretly relations with girls before marriage like he was talking with them on phone, nevertheless after marriage, his wife caught him talking on phone with girl or a message from one girl, what makes the situation complicated if she asks him to check his phone but he refused and created a problem, she absolutely will ensure that her doubt was right. Moreover, when the man all the time is busy with his job or his friends and has less time to spend with his woman or his children, she would feel insufficiency towards her and if any bad thing happened at home, she will blame her husband for this. Maybe I focused only on men as the cause of breaking up the relationship, but also women can be considered too e.g. opening up the serious topics on times when her man is not in his mood or not ready to discuss with her, not taking care of her outside appearance like getting out of the kitchen with the smell of food and dirty dress and sitting with her husband, giving care and love to her children and forget her husband…. Perhaps I extended the brief words of breaking up the relationship into some examples to make them clear.