Help...

My boyfriend tell me how pretty I am all the time and all this other stuff but sometimes I feel like it's because he's my boyfriend and BestFriend for over a year. I have a really fat stomach and I'm really insecure about it but he's always telling me how prefect I am. I feel bad because he says he can never make me feel good about it. And I just can't help it because I feel fat. Even tho I know I'm not. I just can't help it. I just feel horrible. What should I do ..