indygal,
There's a lot going on in your posts here, and I will just pick out one theme.
Your guy is obviously getting into the "blame game" big-time with you. He thinks that everything around him is falling apart and he cannot do anything to stem the tide of collapse. He's afraid of how things are going and he is desperate about the future. All this has to be someone's fault.
In choosing YOU as the one who's to blame, it may be that he isn't blaming you in the sense that he really thinks it's all your fault. He may be choosing a safe target to vent all his feelings against. I know that won't make it less unfair, but perhaps knowing this, or considering this possibility, will help you.
When he give you the "you would be better off without me" line, that's a lot closer to how he reallt feels. He may blame you, but in reality he sees everything as his own fault. That's of course a false lesson he learned from abuse.
But it doesn't end there. When he blames you for all sorts of things that cannot possibly be your doing, he is turning you into HIS victim and he's showing a lot of disrespect. This may sound harsh, but I personally don't think any partner owes it to her guy to allow herself to become his doormat. It's not good for either of you.
It's not good for you, first of all, to think that helping him recover means you should accept behavior that's destructive to your own self-esteem and well-being. You are dealing with a man recovering from sexual abuse. This will take years perhaps. How much mistreatment will it take before it all starts to affect you very badly? And why should you allow this in the first place?
Beyond that, what effect will this have on your relationship? If you put up with bad treatment you send him the wrong message about your relationship: you signal to him that your needs and concerns are not important and that you as a person don't matter.
It's not good for him either. By acquiescing in this sort of treatment you are allowing him to escape from what he REALLY needs to do, which would be to work towards sticking to safe and reasonable boundaries in his relations with other people and facing his issues as they really are.
I'm not suggesting here that you should suddenly become a tyrant with him. But it just seems to me that there needs to be some movement back towards what a healthy relationship is all about: two people interacting in a way that brings joy and fulfillment to both of them.
Perhaps the key here is "movement". I think he needs to hear from you not just expressions and assurance of your love and support, though sure, that's very important. He also need to hear what you want and need, and he needs to know that you expect progress in that direction: his recovery isn't just about himself, or at least, it isn't if he wants to stay in a relationship.
Standing up for your own needs and priorities may sound selfish, but in fact, when you do that you are setting a very good example for him. If he sees that you insist on good boundaries, demand to be treated with respect, and will predictably react to protect and assert those demands, you are showing him exactly what he should be doing.
Perhaps it will help if you think of him as thrashing around in a raging sea. He feels lost and doomed, and then in the sea he sees a rock standing firm against the surf. He swims to the rock for safety and holds onto it. But if the rock itself begins to crumble then both are lost.
Much love,
Larry