Wait, your husband makes copies of your DIARY? and not the good parts, just the BAD parts? I don't know if it's my place to say, but he doesn't sound like a very supportive husband... again, I don't wanna seem cheeky, but that makes me a bit concerned for you. You say he snoops around and checks everything? And would "try to use it against you"? Why would he do something like that to you? Spouses should be supportive, right? Not suspicious, snoopy, and manipulative... do you think marriage counseling could be a possibility somehow? :/
I really hope I haven't spoken too brazenly... I mean, I don't know a thing about your relationship with your husband or anything; it just doesn't sound good or helpful to me... and if such, if any, relationship tensions are the source of some of the problems that cause you to cut, it should be an issue that needs to be dealt with, right? If it would help keep you from cutting, I mean...
Idk, it's 6 am, I'm a sleep deprived college student....I'm rambling a bit, sorry.

But still,