I think there is something suspicious about the idea of "we have no secrets".
I know it depends on how you define secrets, but in many cases, what is meant by "we have no secrets" is that the other partner has no privacy. It doesn't always mean that, but it often does IME and it always slightly sets my antenna off because it can be a bit of a red flag.
OP I think that the diversion about DV, double standards etc. is a red herring. What people are concerned about, is that you seem to be imposing your version of how your DH should respond to the abuse he has experienced, on him.
You just do not have the right to do that. You're lucky, he's not angry with you, he doesn't mind that you've invaded his privacy and confronted him with a demand to engage with past abuse. That may well be because his boundaries have been so skewed, that he doesn't see anything wrong with that; or it may be because he's actually ready to deal with this now and you happen to have hit this just at the time when instead of it causing friction in your relationship, it is something you can support him with.
But you come across as someone who isn't very aware of the need to respect the boundaries of someone you feel you've rescued. This is the internet and obviously this is only a snapshot, so that may just be the way you express yourself; but you've been told by so many other people on this thread, how you're coming across, that it's quite disturbing to see how utterly impervious you seem to what they are saying.
We are expressing a concern that you have set yourself up as your DH's rescuer and will not allow him to escape that role. Here you are rescuing him again, when he many no longer feel that's necessary.
Please let him be the lead on how he deals with what happened to him. Please do not believe that you are better placed than he is, to decide how he should think and feel and act about it.
I'm sorry if you already know this and have no intention of steam-rollering him, but it really ought to give you pause for thought, that you're coming across as someone who doesn't know this.