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Relationships come from living in your mind and not being able to let go of your mental
version of yourself, of someone else.
People change and that is your problem.
If you choose to live in the past and refuse to update your internal version of them.
Long lasting relationships usually involve clear minded people who know how to pay attention to the person that is right in front of them came about moment, not about something that he never knew existed or not.
Know the right thing at the right time and also act on it.