Set Backs and Starting Fresh

So, I have been on MFP since March and at that time, I was down a total of 50 lbs from my highest weight. And I was stuck on a plateau (since September). I worked out with a trainer 2 days a week, did cardio 3 other days a week (at least) and kept good track of my good eating habits. And I tried,so very hard, to keep myself motivated. I don't want to go back to where I was. I told myself I was practicing maintenance and it worked. My husband has been right here with me, supporting me, taking care of his own weight loss and fitness stuff. And then the scale started slipping up. I hadn't changed anything but I gained about 5 lbs. But still I didn't give up...until the past two weeks, when I allowed my eating to creep up and the heat to be my excuse not to work out as much. And now I am up a total of 12 lbs from my lowest weight and I am scared of the slippery slope I am on. So, today is Monday and it is a FRESH START. I reset my weights on here to show where I was at the beginning of my journey (18 mos. before I joined here) and where I am now. So, I had my good whole grain and protein breakfast, And I will have my brown rice, fruit and greek yogurt for lunch and my turkey burgers for dinner. And I will do my cardio and upper body strength training tonight and I will not step on the scales again until next Monday morning and I will fix this set back. I will use it as a reminder of how easy it is to lose focus. This is so very important to me. I know I can do it. I just need to remember that I know that.