http://www.marriagebuilders.com/graphic/mbi5525_qa.html blue, not sure if you saw this section, it might be helpful to review. also it might be helpful for you to look at
http://dearpeggy.com/affairsmenu.html might help you get a handle on whats common and what's not when dealing w/this crap. smart to stay w/the experts advice more than the population here when first starting out. we are good at telling you what worked for us, but not what is best for you. Steve is great coach to work as a go between for you and your husband. doesn't sound like you guys have hammered everything out yet due to the fact that he still sees her at work. Dr. Harley would recommend severing ties w/that job or transferring. if not the affair will stay alive in everyone's mind for much longer than necessary.
if your h is willing to get off the fence and work on your marriage he should have no problem doing homework on how to reconcile your marriage. i began by printing every single section out and studying it w/my husband. we went to seminar too and have free access to dr harley to ask questions. we are far from perfect but our journey (19months) has been a long one. I can honestly say our marriage is the envy of most people i am friends w/, they don't even have the first clue.
i didn't get married and have children to hang out w/my girlfriends and go to bars and shopping etc.... i chose to invest all of my time and energy on my marriage and not to mention how this is helpful in other relationships.
I am sure your brain is swirling, there are many places to start such as the above and implementing boundaries (boundaries by dr cloud and townsend), but first and foremost you have to find out if h is willing to jump on the wagon or if you need to roll on out w/out him.