Why do we meet people who will just leave you later?

Why do we meet people who are not meant to be in our life and we still get attached to them emotionally and then someday you lose them really unexpectedly
I just want to know why we meet someone unexpectedly and then they make your life really better than it could ever be and then you fall in love but then because of a really unexpected reasons you can't be together anymore and it's not even in your hand to change that or control that. If it's only meant to end up being the biggest heartbreak then just why do we meet them
Why do we meet people who will just leave you later?
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