back again

Ok so here is my sad little story. I decided to lose weight and to get hubby to too. Hes gone down from 425lbs to currently 342lbs. He was doing great, Me, well I lost 10 lbs but have gained 2 back. I didn't try over the summer
He is now at a stand still wont exercise and isn't trying anymore. Hes slowly going back to normal bread, normal milk etc... I have decided once again to jump back on the healthy lifestyle wagon for both myself and him. We started a bet at work starting tomorrow Sept 1st. running through December 1st who ever loses the most gets the money in the pot. This is in hopes that it will help if we (all the ladies at work) are helping each other it might work. So anyways here it is guys, I need help.