I have a question about my weight???

okk i have been on a diet for the last 3 months i am5'3 and used 2 weigh 120 now i weigh 110 i dont wanna lose animore but i have a question normally if i eat little during the day and exercise i weigh 110 but iif i eat something sweet or chocolate or full of calories my weight rises bak to 115 nd the only way for me 2 bring it down iz if i eat little again and exercise anybody knowz wat this means???any ideads on how to stabilize my weight??ani help would be thankful