The first thing you need to understand is that cheaters lie. They all do. They have to. It kinda comes with the territory. You can't conduct an affair and remain honest with your spouse. It's pretty much impossible. At best, it's lying by omission.
Most of the time when someone discovers their spouse is having an affair it's just the tip of the iceberg. I'm not telling you this to make it worse, and we can't say for sure that more has happened than what you've been told, but it's very, very common for the cheater to only provide bare minimum details, minimize, and flat out lie about what all has happened. There's a good chance this has gone further than you've been told.
Like I said, I'm not trying to make this worse, and I hope it's not the case, but you should brace yourself for more revelations.
As it is right now your husband isn't a safe partner or a good candidate for reconciliation. He should be willing to do whatever it takes to salvage this and fix what he's broken. Including absolutely no contact whatsoever. Even if that includes finding a new job or transferring to a new location. It doesn't sound like he's anywhere near that ballpark if he's still contacting her and maintaining any kind of relationship with her.
There's a saying here. Sometimes to save a marriage you have to be willing to let it go. When I discovered my wife's affair I put up with her telling me they were "just friends now" because the physical part of the affair had ended. She kept contact with him and still talked to him regularly over messenger and voice chat. I tolerated that for about a month before I couldn't take it anymore.
I drew my line in the sand. I started calling divorce lawyers. I set up a couple of consultations right in front of her. When she realized I was serious she broke down in a way I'd never seen her break down before. I didn't budge. So she cut all contact with him, put in for a location transfer at work (he was a co worker), and rolled up her sleeves and began the arduous task of convincing me there was still something worth salvaging.
That was 19 months ago and she's been solid as a rock ever since. She rearranged her priorities and put me and our marriage at the top of her list. She hasn't backslid or slipped up since. I'm still incredibly hurt, of course, but I'm no longer hypervigilant or questioning where her loyalties lie. But it took me shaking her world up to snap her out of it.
I'm not saying that it's a magic bullet that will automatically push every wayward spouse into recommitting to the marriage, but if there's a chance it can happen, it's usually something like that that will snap them out of it. Trying to nice them back into the relationship and doing the pick me dance almost never works. You have to show them that you're getting out of infidelity, no matter the cost. If they don't snap out of it and continue pursuing the affair partner then that will tell you something, too. You have nothing to work with and you're best served detaching and getting out of the situation. Otherwise you could spend years in misery trying to salvage the unsalvageable only to have it end anyway.
Getting out of infidelity needs to be your goal. Not saving the marriage. Not winning him back. Getting out of infidelity. If he reacts by turning back toward the marriage then you can start considering if that's the path you want to walk. You need to take your agency back and stop letting him run the show. You're the prize here. Not him, and certainly not his affair partner. Make him earn it.
I'm sorry you've found yourself here. I know how bad this sucks. I was devastated when I discovered my wife was having an affair. Betrayal trauma is real trauma. For most of us it's the worst experience of our lives. Don't beat yourself up for feeling the way you do right now. It can take years to recover from this. 2 to 5 years is the general rule of thumb, and reconciliation can be a lifetime work in progress.
Stick around and keep posting. You'll find some great support here. Most of us know understand what you're going through. Ask any questions or just use us to vent if you need it.
[This message edited by Pogre at 12:47 PM, Friday, November 13th]