I like to look at it more as "Better to have loved and
lost than never to have loved at all".
Loss doesn't have to hurt when you can walk away from the relationship with a deeper understanding of how different people are and maybe a lesson or two in life that you acquired from knowing said person(s).
Sure, the separation is hard to adjust to sometimes and there can be hurt involved but reflection on the experience does not have to remain in a negative light.
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Pets Need Love Too