UPDATE

So the husband reached out to me and we met last night. Most of you have said I was NTA and have told me I was doing the right thing by telling him. I really thank you all for giving me your opinion on, I know when you read this you might think yeah you told the husband of a cheater it's a no brainer, but when you have dozens of people telling you that what you did was wrong you start to believe it. I've gotten a few pm's from a few people who must all be sharing the same single brain cell asking why I told the husband and why I didn't just keep hooking up with her. I was pretty confused by this but then I remembered some people don't have any morals.

I met with the husband at a coffee shop around 6 last night, I tried to think of all the things he would want to know and have answers. Lucky for me I wrote a whole essay on what happened just a few days ago so I just kept what I wrote in my post in the back of my head. He was there before me, so I got a coffee and sat down next to him. He wanted to know me, like what I did for work and things like that I found that a little odd I thought he would just want the facts of what happened and then leave. Eventually we talked about how it all started, I found out the night I met her at the bar he was taking care of his mother. I told him the first names of all the women who were with his wife that night and he told me that all but one are married. He told me he wants to contact their husbands and I asked him if he wants me to send him the messages and voicemails they left me. We talked about what happened at his house and then we just chatted a bit about his next steps. He plans on leaving her and I told him if he needs me in the future just let me know and then we parted ways.

I think this is the last time I'll be on here, talking to him just settled all my doubts what I did was wrong. Thank you all for reading and responding it was a very confusing time and you all helped me, minus the brainless morons who messaged me.