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"Couples that do things together will last longer"

I was browsing the web today and I read this same quote in three different websites.
As I was thinking whether the quote does makes sense or not, came across my mind how couples that lives far from each other keep their relationships longer? I think its not just about do things together but respect, humor, tolerate are some of the thing that couples have to consider to make one relationship last longer... its all matters in one relationship.

"A love with conditions attached would never last. Only pure, unconditional love will last forever."