Yup, OW has apparantly left her DH, moved to b with Cod's BIL...and is now high and dry. She is a victime of hi because he lied t her, just as Cod's s is. yes, know, married man and all that, but some men do really wnat to leave bad wives and with good reason - how is OW to know whether he was lying or telling truth? He could have told her all sorts. She has believed what she wnats to believe, just as Cods s has.
He is completely to blame.
Doesn't make poor cods s position any better or worse...very terrible fo her and DCs