Once the infatuation phase has ended, how to you keep the spark alive in a long term relationship?

How do you keep the spark and chemistry going in a long term relationship?

How do you know if it’s time to call it quits or if this is what the majority of people in long term relationships go through?

What about those couples that seem more in love after decades together. How do you know if this is just part of relationships or you are just settling?

Once the infatuation phase has ended, how to you keep the spark alive in a long term relationship?
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