I know I was. I found a very cool meal planner online that helped me alot. learn2eat.ca makes eating healthy easy. You eat a balanced diet composed of foods you enjoy.
Getting tired of dieting is normal. It's hardwork and it takes willpower for you to survive it. That is why it is important to have a diet that you can live with.
I think everybody gets tired once in a while. I'm also one of them. My diet used to be on and off but I finally found a diet that really works for me. I haven't stopped since.