friends with opposite sex

Yes it’s a form of true emotional cheating as this is what really happened to my spouse & his “so-called” best female friend (already Married) who turned out having sexual affairs for the past 8 years starting from pure heart-to-heart conversations (DAILY from 7am till 4am ). Initially they started off complaining about each other’s spouse then slowly developed into strong emotions & feelings for each other. Then ended up, my spouse & her started ‘going out late’ until 4am DAILY and I even found her intimate items in my spouse’s car & house!!! This female friend was also someone whom I knew for more than a decade and she even had A HUSBAND even till now while my husband is her affair partner who provided her with all luxury goods, delivery food orders and secret business partners in cahoots. P.S: Her husband’s rich & loves her a lot. But she’s not satisfied as she complained her spouse isn’t romantic & sweet enough to her. Still, this doesn’t give her any reason or excuse to steal another man, somemore a married man with a wife & children!!! All along for the past decades, I always had 101% full trust in my spouse but he betrayed my trust by lying to me constantly that this female friend was his true soulmate and BFF in life and he simply cldnt believe there’s an existing truth to a Platonic relationship between a woman & a man.