How did I let this happen

I had lost so much weight and felt better than I had in the longest time. Today I weighed myself for the first time in months. My lowest was 189, today I am 291.6.

I am so very disappointed in myself for losing control. I put a lot of hard work into losing the initial weight and to gain it all back, I can't describe how saddened I am. I lack strength and accountability. I need to reach deep within myself and find what I have lost.