Dieting help

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Me and my partner are trying to diet we are eating smaller meals and trying to eat all healthy foods and we are both excerciseing my partner more so. only i am staying at the same waight and my partner is gaining waight everyday. am i doing something wrong? is their a diet you have used? is their any other helpful tips that you could offer me? Thankyou so much for your time and most of all for your help.