Why do bridge partners divorce ?

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For the past year I have been taking bridge lessons at the Essex Bridge Center, and have wondered why bridge players end up dissolving partnerships in order to play with someone else ?

Bridge is a challenging card game that requires desire, discipline and determination for success.  In that respect, it is perhaps no different from marriage.  From my limited observations, the reasons for bridge partner "divorce" mirror those of real life:

Infidelity: preferring to play with another person, rather than your regular partner

Incompatibility: growing apart as a result of a different level of ability, desire to learn or passion for the game over time

Other commitments: pressures of work or family that result in bridge no longer being a priority.

I am sure there are other perfectly valid reasons, but those are the ones that come to mind. 

My conclusion is that bridge partnerships are no different from any other relationship, they require effort to maintain and a desire and willingness to make it work.  Who said life or playing bridge was easy ?