Why is it legal to divorce?

I get the abuse cases and such.

What's with the wedding vows. People do all this stuff and apparently it means nothing.

It think weddings should be a one time deal. We already have a casual dating option.

" I, _____, take you, _____, to be my (wife/husband), to have and to hold from this day forward, for better, for worse, for richer, for poorer, in sickness and in health, to love and to cherish, until death to us apart."
Why is it legal to divorce?
Why is it legal to divorce?
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