How did you know he/she was the one?

McMillanD
How did you know he/she was the one?
For the couples who have made it the long haul (married or not). How did you come by the realization that your partner was someone you wanted to share your life with for as long as possible?

Even if you aren't together anymore, for whatever reason, I would still like to know how you knew you would be together for a long time (at least what made you think so at the time)?
How did you know he/she was the one?
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