K.M.
I'm not sure if these will help but I have a few ideas.
When my hubby and I first started dating we were terrible arguers. We'd just talk over each other and get more and more angry. Finally we started using "over." As in, I would talk, and when I had said everything I wanted to say, I'd end with "over." Then it was his turn to talk, and I would stay quiet and listen until he said "over." It was a little silly, but it worked, and now we (usually) can argue without talking over each other. Even still, if he starts talking over me I just say, "I haven't said 'over' yet," and we fall right back into it.
Another time with an old boyfriend, there was something he wanted to talk about but it was hard for him. So we sat on the floor, back to back, and talked. It was easier for him when he didn't have to look at me, kind of like email or texting can make it easier sometimes. And I also think our backs touching helped; a sort of subconscious support or something.
My last thought on this is actually a lesson I used to teach in a program for adjudicated teens called "Inner Scar, Outer Scar." You probably wouldn't do this EXACT thing with your husband, but maybe you could tweak it to work for you somehow. We would begin by everyone sitting in a circle. Then around the circle, one a time, everyone shows a scar they have on their bodies and tells the story about how they got it. Once that's done, the instructor then talks about how we all have scars on our bodies, but we also all have "inner scars" too. It could be an emotional scar from someone who did something to hurt you personally, or it could be because someone you really cared about, died, etc. Then we'd go around the circle again and anyone who wanted to (we didn't force it, of course) could tell about an emotional or inner scar they had. Usually an instructor would go first. It was really pretty cool. Most of the time every student would participate and it brought the group closer.
Hope that helps.
Edited to add:
I'm of the opinion that it's just not necessary to tell your SO all your skeletons. Some things are better left in the past. It doesn't mean you're not being honest. It's just that sometimes there's a reason that things ARE in your past, and not your present, and it's perfectly okay to leave them there. I don't know everything about my husband, and he doesn't know everything about me, and we're okay with that.