The OW was "sort of" a friend. She was in my BS's running group and they had social things like BBQ's and birthday celebrations at restaurants. When she got a road bike, I took her and her friend out on a route I used to do a lot and another time she rode with me a a few other people. She came to my father-in-law's funeral. Just a couple of days after telling my husband she was attracted to him and he admitted he was attracted to her. I gave her a hug that day and thanked her for coming (as well as the friend who went on that bike ride, and who I later found out had hit on my husband months before, and later asked OW if she'd ever want a threesome with her and him. Puke!) Anyway, saw OW again the very next day at a touristy area about an hour from home when we happened to be in the same area and somehow my husband knew she was there with her sister (either from FB or texts). He randomly drove away from where we were going so he could "surprise us" by "happening upon her". Wow. That was SO weird. So the last time I ever saw her was in a parking lot for about 15 seconds before we had to get out of the way of other cars.
The morning after Dday 1 I saw she had emailed him asking "Are you ok?" I replied from my own email. "He's fine. You don't need to email him anymore."
About a week later I sent her an email telling her he is not available. I'm not leaving him, etc. I was amazingly civil and matter of fact and just trying to ensure she knows I'm not going anywhere and won't let her take my husband. She never replied to either email.
About 6 weeks later I couldn't shake thoughts of her and felt like I needed more closure. I sent her an email asking if she was even sorry for what she had done to me. I drew a clear picture of the pain I was in because I wanted her to know how deeply she hurt me. I was less civil but still not flying off the handle. I told her I wondered if she even thought of me as a real person. A person who's life she had tried to destroy, and if she thought about my kids and what this would do to them if they knew and/or he actually divorced me for her.
She never replied.
Three months later, Christmas night, I found out they had still been seeing each other.
I vacillated over whether or not I wanted to make her look me in the eye and explain herself. And give her a piece of my mind ... face to face. I finally decided I didn't want a new and fresh image of her to haunt me all the more.
I finally emailed her again. This one a little less civil still, but not outright nasty. I told her she needed to respond to that email if she didn't want me showing up at her doorstep or at a morning run with her running group.
She did respond. And she apologized and said some not so bad things. As if there's really any way to explain one's self. But where she went wrong was not agreeing to leave the cycling group I was in that met around the corner from my house and was pretty far from hers. My husband had left their running group, which her husband was in. The least she could do was leave me alone and let me have the cycling group. But she thought it should be "fine" for us to ride together.
Well, that ended my civility. No more nice little Christian girl. I told her she clearly has no idea how much I hate her and that there will never be a time when it will be "fine" for us to ride together. I told her if she showed up at a group ride I was at I would kick her ass, trash her bike and verbally humiliate her making sure everyone knew what an adulterous bitch she was.
I have to say ... I really LOVE that I got to tell her off that way and put some fear in her. I'm significantly taller than her and with the adrenaline rush I'd have as the betrayed wife, I could probably do some serious damage. And I really didn't care if I was hawled off in a police car.
Well, while she never actually showed up to a ride, she RSVP'd a few times, I think just to get on my nerves and make a point that while she's cowering for now, she's not officially leaving. And she also kept posting on the group's FB page.
When it finally came down to it, I couldn't take it anymore. Wondering if and when she was going to show up and just seeing her effing name on FB. I left the group. The bitch won. I know she has since ridden with them.
I have yet to see her in person but often wonder if and when I will and what that will be like. She could show up at any running event my husband is at, and some of the cycling events. I don't go to a lot of them (he does so many) but found out she was supposed to be at one recently so I planned to go, basically to "babysit". Turns out she had an injury and wasn't going, which I found out a couple days before. But my husband was already excited about me going (and was clueless as to why I was going for some stupid reason), so I still went. However it was an emotional day. I just kept imagining seeing her there which I'm sure I would have if she had gone, since it was a small event. I told him later that I just wouldn't be able to handle it, so we have to figure something out with these events.
But, in answer to your questions, I haven't seen her, I did email her several times and finally threatened her and cussed her out. And I'm glad I did. I believe a phrase I used once was "I will bloody your face". 
[This message edited by Patchy at 9:19 PM, October 24th (Thursday)]