Can't seem to get motivated..

I usually can go about 2 months strong..everyday at the gym, busting ass, seeing results...then BAM! no desire to go anymore.. I've kept a fitness journal, my fitness pal, done the T25... I have the desire just no motivation to get off my fat ass anymore. I live in a house full of males (even the pets) and I feel awkward exercising around them at home. My husband doesn't understand what its like to be overweight. He has an athletic build and is damn sexy.. He constantly tells me I'm beautiful and couldn't care less about my weight... but I'm still bothered.. caught my youngest son eating a jar of peanut butter with a spoon (one of my bad period habits).... idk I feel like a blob of failure.. and a terrible example to my kids.

What motivates you?