Throwing my hands up in the air

So, I am at a loss as to what to do with Ethan and potty training. I was there. I had a taste of freedom. I had a delightful 2 months of a diaper free, poop free life and then it came to an abrubt halt. All of a sudden, he's pooping his pants again. Just like that. What am I doing wrong? I really want that life back, probably more than he does. HELP ME! I'm in poop hell!!!!!!