why relationships break up

The number one key issue to consider on why relationships break up is starvation and neglect seeing the moment you stop feeding your relationship it begins to wither and eventually dies off.
Think of your relationship as a young plant that is newly budding- it requires the right amount of sunshine, nutrients (food) from the soil, air from the atmosphere, time and effort (work) to bring it to maturity.
In pretty much the same way, starting a relationship, feeding and nurturing it requires your input, contributions, investments of time, effort and attention for it to be long lasting.
Right from the moment that you decide to start off a relationship, you will need to consider how well and how best the options and prospects you stand to gain as well as what is in it for any other party involved/concerned too.
There is no relationship that succeeded yet on the sole effort of a single individual. Rather, both individuals involved in that relationship must make out time to equally invest (contribute and endeavor to add value from time to time) in it.
Building a lasting relationship requires work.
As an individual, you must have realized that life in general is about relationship- the sun, moon, stars and the sky all have a relationship with each other; plants, vegetation, soil and animals in the wild all co-exist in a relationship; the wind, seas and ocean floor creatures have a relationship of their own; man, woman and all the forces of nature as a whole have a relationship that will continue to exist as well as last aeon of years to come.
Suffice to note that relationship forms the bedrock of existence on earth (this holds true for animate and inanimate things alike).
A relationship is a give and take arrangement of sort- both parties involved must learn to strike a balance between their expectations and the efforts made to invest tangibly in the relationship.
Conceding on many occasions for a partner who is lackadaisical over the relationship will not work at all- this is so where it is only one of the two individuals involved that does either the giving or receiving.
Both parties involved from time to time must learn to switch (i.e. oscillate) between these dual roles of either receiving from the relationship or giving back to the relationship as occasion demands.
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