SR, no more exposure from you is going to help at this point and could only damage your court case. The last thing you want is some sort of stalking charge/harrasment charge. That only hurts you. The only thing that could get the University of their a$$ is students who threaten legal action if they can show that your H is favoring her. You can't do that other students would have to.
Go see the L. You have more rights than you think. Your H probably isn't aware either. It seems he is setting you up. Find out how to protect yourself and your kids.
Finally, you can't make him do anything. You can only control yourself. Work on GAL, detaching, etc. You have to finally really let everything be about you and not worry about his reactions. He'll either come around or he won't but either way you'll be ok. I always recommend Relationship Rescue by Dr Phil. It compliments DB and really helps change communication patterns.