Can't have with my boyfriend, should I move on?

I love my bf. I really do. He's a great guy, but he's fat. I know that sounds shallow, but he's gotten a huge belly over the last couple of years. I'm so very unattracted to him. My previous question was about his belly, but I can't movtivate him to lose it. I'm afraid he will just get fatter and fatter. I love and the thought of him on me....ewww.