Why do people we have become very close to and love tell us "I'll never leave you" and then they end up leaving us?

sage2021
Are they just lying to us? Is it so we won't leave them if they tell us that?
Why bother saying that to someone if you know you aren't the type of person to stay?
What makes them leave?
Why do people we have become very close to and love tell us "I'll never leave you" and then they end up leaving us?
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