In the Mishna (Gittin 90a) there is a dispute between Tannaim. Beis Hillel says that a man can divorce his wife even if she ruined his food while Rabbi Akiva says even if he found another woman who is prettier than his wife.... This dispute needs further clarification as to why the Torah would permit a man to divorce his wife for such trivial reasons. What horrible thing did she do that justified divorce? In fact it seems the Torah is clarifying to us the underlying dynamics of a viable marriage. The fact is in order to have a good marriage, it is necessary for every man to view his wife has the most wise, the most beautiful and the most wonderful all the women in the world ( And similarly she needs to have comparable thoughts about him.) Therefore if he happens to discover another woman to be more beautiful than her that is an indication that he no longer views his wife as the most beautiful. Thus this is a sign that the marriage is not working out. Similarly this is true regarding the fact that she ruins his food. There is a general rule that a person doesn’t view anything wrong with himself. For example if it happens that he mistakenly said something that he didn’t want to say, there is no question that he won’t get angry with his tongue – since he is his tongue and his tongue is he. Consequently if he feels any criticism against her such as that she is ruining his meals – this is a sign that he doesn’t feel the necessary unity with her and thus the marriage is not working out. Therefore he is able to divorce her. Thus we see that the ruining of the food is not the cause of divorce but rather the cause is the fact that he feels a need to criticize her.
Sanhedrin (7a): When the love between me and my wife [Rashi] was intense a bed the width of a blade [of a sword – Rashi] was enough to lie one. However now that our love is not so intense – a bed the width of sixty cubits is not sufficient to lie on [Rashi].