Work So Hard I Quit

I suffer from a condition of working out for several months then quitting. Last year I lost 16lbs over the course of two months, then I quit and gained 30lbs back. This year I tried to lose weight for three months but saw no weight loss so I rage quit and gained 5lbs back. I know I am not the only person to struggle with this unfortunate condition, and I am sick of carrying this gut around with me everywhere. I want to know what you think about this condition, and if you have discovered a way to overcome quitting.