Is this an example of a love myth? How important is compatibillity in a long...

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...term relationship? Is it true your partner should bring out the best in each other? Or is it just another myth about how love conquers all? What's key to long term relationship with a spouse? Being friends( I don't think this works) ? Keeping the romance alive? Sabaticals? Or is compatibility a bigger indicator of success and happiness than people realize?