Not much to add, I totally hear where you're coming from, much like where I am at right now.
This board has been wonderful at helping me on a day-to-day basis.
The detachment and growth thing is really hard to do, I know. You really don't have to deal with dating right now, ignore that, you are still really young, and will go there when the time is right, if it comes to that. Don't let him dictate what you should or shouldn't do about your marriage sitch. He has other motives. Be strong, you can do it!