Falling apart

Okay so I know this is a little different than most things that are posted on here but I really need some advice. So I'm 18 now and about 5 years ago I started cutting, developed an eating disorder, and became really depressed. However, after a lot of work and prayers I am much happier now, eating normally, and currently a little over a year has passed since I cut last. But lately things haven't been so good. I feel like my world is falling apart again and every time I see myself or go to eat something I think I should stop eating for a while again and I'm getting an overwhelming urge to cut again. I don't know what to do. My boyfriend of two and a half years has been my rock through everything but I don't know if I should tell him and how do I keep myself from falling into this deep dark hole again?