If you are single, what are some things you're glad you don't have to experience that those who are in relationships or are married do?

In a relationship, there are always two sides. One involving love and affection and the other heartache and pain. You can't experience one side without experiencing the other unless you're single.
If you are single, what are some things you're glad you don't have to experience that those who are in relationships or are married do?
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