A man striking a woman should never happen. If you can not trust her, leave her. If she sleeping around on you, then you ain’t doing your job. Cause a woman should always be on a pedestal and you should make sure she is content with you and the situation.
Proverbs 6:34 For jealousy arouses a husband’s fury,
and he will show no mercy when he takes revenge.
So in this case it sounds like if you get the husband to this state, you better prepare for the worst, cause a jealous aroused husband may get even the worldly way and not the Christian way.
If you don’t mind time then do the husband fury crime and go to prison for life. If you do her you better do them both get two for one.
Now do you think the Holy Spirit will give you the okay to kill another human being??
No I think so, but control your anger at all times.