I know exactly how you feel. I've been struggling for self injury for a year. It started with pinching, scratching, etc. and escalated to cutting and burning. I cut for about two months before my best friend saw and made me promise him I'd stop; he understood that it would be hard and why I did it because he used to cut. Usually it's only people who have cut that understand others who cut. It seems like I didn't self-harm for very long, but to me it seems like forever. I've been able to stay away from SI for only two weeks, and sometimes it seems like it's only been a minute and sometimes it's more like two years. When the hard times hit, I sometimes resort to burying myself under my covers or something to keep from hurting myself. I have to call him often so he can talk me through my urges and I do the same for him.
I'm keeping my promise no matter what.
Even if your husband doesn't know what it's like to have quit cutting, he can still help you by being there to vent to whenever you feel the urge. If you two are getting married, he must love you. Unconditionally! xD It's nothing to be ashamed of, I promise. The scars never completely fade, but you can keep from making new ones. I wish you the best of luck!