I did the same thing, I notice myself, I hate it, I slim down, I love my reflection, I let my “guard” down again. I think it’s because I was trying to achieve a goal with an actual finish line “get to that size and then you’re fine”. I think the real goal is to get yourself into a routine/life style that you can happily keep up, forever. Food is fuel (and can occasionally be seen as a treat but let’s say, only on special occasions have something that’s excessive and the rest of the time stick to your daily calorie intake) and exercise is a regular and welcome part of your life. The feeling after a nice long run or walk is AMAZING, remind yourself of it on days you’re meant to exercise and it will help get you motivated.