Traditioal marriage is even the easiest to dissolve with this type of violence she can go to LEGAL AID COUNCIL in her state for free counciling and she better run for her dear life before that monster kills her and abandon her kid in motherless home so he can have time with his lover.
I don't blame you jare! Life is always not fair when you need it to be, just expose the whole issue invite your wife and the other lady and put all the cards on the table....but pray and ask the holy spirit to interven first so those two Ladies don't strangle you for nothing sake.
My dear just go back and face your family there is a challenge in every marriage ,it your ability to manage it that makes you a strong woman and not by running away,go back and chase that strange outtttttt