contact her or her husband?

St

so long story short I found my husband "talking" to another woman. we worked things out but I think she may be contacting him still I found her in his YouTube page and his Google plus but she has NO videos and no other contacts except him. I know she is married with children( as are we) I looked her up when I found her number and saw her on Facebook with her husband. I don't know if my husband is still talking to her but I know she still contacts him every so often. my question is ...should I confront her? should i try to get in touch with her husband?? problem is i lost her number and I'd have to rely on some snooping from my glow family lol I don't have Facebook so I can't snoop a whole lot. I just want her out of my life and if she still is in contact with my hubby then I want him out of my life too. I just want to know.