What has your husband done to correct his contribution to the dysfunctional part of your marriage?
Also, if you are to ever get past the affair, then ALL contact must stop forever, and that includes ridding yourselves of any and all affair memorabilia (cell phone numbers, photos, gifts, etc). I will bet good money that he still has one or more gifts from her. You have to understand that it is very difficult to correct issues in your marriage when one spouse has constant reminders of a third party.
All the best, -NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.