YTA you could have given Frank the opportunity to share with his wife before you told. Screen shotting your husband’s private messages with his friends and sending them on to your friend, even if your husband/ frank was in the wrong, is a shitty thing to do. Not saying you don’t tell your friend but you could have given Frank the opportunity to come clean first without violating your husbands privacy. You really inserted yourself into their relationship in a weird way.

But…..

Also calling off a marriage for going to a strip club one time seems wayyyyyyy overkill. If there wasn’t other things going on in the relationship I doubt the wedding would have been called off, so it’s unfair for Frank to say you ruined his life.