A lot of things have to line up. These are a few of them.
  1. You have to love them.
  2. They have to love you.
  3. You have to meet at the right time.
  4. You have to meet, like at all.
  5. They have to want the same thing as you.
  6. You have to not die.
  7. They have to not die.
  8. You have to not ruin it.
  9. They have to not ruin it.
  10. You have to love them for who they really are, not who you thought they were.
  11. They have to not be your cousin, you have to not be their cousin.
    Suggested by   @evehewson