The best thing to do in your situation is to stop trying to be in control.  Why do you want his passwords?    So you can give yourself the illusion of control?  Sharing passwords with eachother in order to feel secure is a big red flag that something is wrong.  In the end, no matter how many of his passwords you have, you will never be in control of who he talks to or what he does, and that’s a good thing.  Don’t madden yourself with the illusion of control.

Unfortunately, you can’t expect anything extra because of what he did in the past.  He doesn’t deserve to be on a leash or stuffed into a cage, but more importantly, YOU don’t deserve to have to deal with that.  That’s just not how relationships work: he didn’t hurt you on purpose–in fact, I bet he was trying as hard as he could not to hurt you, and that’s why punishing him doesn’t make sense, and also why it won’t make you feel any better.  If you think you can’t be happy with just forgiving him and going back to being equals, then you probably should just end it.