weight loss and eating disorders

I'm 20 years old, I weigh 160 and I'm trying to lose 20 pounds before my wedding in May. my fiance and I are doing a diet together. But what I'm struggling with is my past weight struggles. I weighed 240 in middle school and became anorexic/bulimic in high school. the way I felt about my body and myself was so low and I never want to view myself like that again. i have a healthy body image right now. the best I've ever had and I'm trying to lose weight in a healthy way without losing my self esteem and basic self love. my fiance doesn't really understand but I would love if any of you had any advice... thanks ❤