Lack of communication
Even the most relationship issues are magnified by a lack of communication, undermining a relationship's foundation.
Because of the substantial issues that communication problems pose, it is important to find the underlying causes of the problem. Fortunately for most couples, there are a number of common issues that are often associated with communication problems.
There are a number of reasons why couples have difficulty communicating in relationships including:
Personality differences
Overfamiliarity
Busy lifestyles
Resentment relating to other interpersonal differences.

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Why relationships don't last anymore.
Non-FictionMy opinion on why relationships don't last anymore.