It's interesting. Pp here saying 'reverse the sexes' fail to remember that in many instances where a man says 'she provoked me' they DON'T mean 'she was shouting in my face/stopping me from leaving/lying to my face about incontrovertible evidence of his infidelity' or whatever abusive tactics narcs like to use to control and confuse their partners.
In many many cases, 'she provoked me' means 'she wouldn't stop going on and on about the fact that I hadn't done that thing she asked.' Or 'she was talking eith her friends too much and I didn't like it' or 'she was flirting too much. I got jealous' or 'I didn't like what she was wearing' etc.
So big big differences as to what provocation looks like and it's completely naive to conflate the two scenarios.
I'm not saying there aren't women who use jealousy, control and anger as an excuse to lash out (of course there are, and I've known a lovely man be subjected to this treatment) but the fact that people are assuming the circumstances are always equal are plain deluded.
I hit my ex. Once. It was an awful toxic relationship and he was the king of mind games. SS and the police were involved and BOTH agencies put the root of the problem firmly at his feet and told me that under the circumstances, they were surprised I'd shown as much self control as I did. Not at any stage did they brand me abusive.
Those of you saying 'reverse the sexes' don't have a bloody clue,
I wish I hadn't lashed out, I wish I had left earlier and I wish I'd seen the relationship for the toxic mess it was but I absolutely refuse to be called abusive, because my ex KNEW and delighted in provoking a reaction. If you've never been there, Be very thankful. I hope you never do.
That all said, none of us truly know the circumstances so it could be any combination of situations. It looks like op has spoken to get friend and it sounds like the husband and wife need to separate and work on themselves for a bit.