Sheriff of these parts.
I want to encourage you by saying that it's only been 7 and 1/2 months. I know that may feel like a long time, but also consider that to him the "wound" still feels fresh. As you probably learned from Joe, it takes a while for your spouse to get over the hurt and learn to trust you again. I know it's not ideal, but remember that you're, unfortunetly, having to eat some humble pie at the moment and it won't always be like this. Believe that but accept that your spouse is going to "act out" (sometimes in very immature ways) on the hurt they feel over this and they may have spells of acting out for some time. In some ways, be encouraged by what this behavior suggests for your future together because it likely shows that your spouse loves you a great deal. If he didn't care that you slept with another man, you'd have a much larger problem!
I hope that helps you frame it some. Use this forum for support while you're waiting on him to improve and heal. Be understanding. Let him vent (I know it can be difficult). Show him that you are trustworthy again over the long haul and he'll likely come around. Remember, when you register to attend Joe's LovePath 911 seminar, you get to go twice. I recommend you two go again in about 6-8 months. Maybe talk to him about that in a few weeks. Tell him that you love him, care deeply about your relationship and want to continue to learn how you can do your part to rebuild it. Then call us to let us know which seminar date you're wanting to attending.
Hope to see you around here often and that things improve for you.