Is cheating part of the 'worse' from the 'for better or for worse' wedding vow?

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"from this day forward, for better, for worse, for richer, for poorer, in sickness and in health, to love and to cherish, till death do us part"

If you take your wedding vows seriously, ...
Does that mean if your husband or wife cheats, you should stay with them and wait for better days to come?
Does that mean if your husband or wife beats you, you should stay with them and wait for better days to come?

If you shouldn't, what's part of the 'worse' days? The poorer days and sickness are already covered in the later part of the vow.
Is cheating part of the 'worse' from the 'for better or for worse' wedding vow?
20 Opinion