You have all my sympathies and I know you're hurting. Please don't make any huge decisions while you're hurting this much and don't do anything that has you committing to dates (like telling your husband he has to do X by Y date or else)...concentrate on yourself only, you need to heal from this.

If you're considering forgiveness, there's a book called Divorce Remedy that has strategies on working through this sort of thing. But first things first, you're in pain and in shock and take care of yourself first.