It's not just your SO, family gets jealous as well. My brother constantly asks me if I'm on steroids, because I'm so huge, ha! My sister thinks I'm a freak because I don't eat bread anymore because I'm a FFB and I just don't do well with bread.
My mom refuses to stop drinking soy milk, saying I don't know what I'm talking about when I tell her it's bad. She also has to tell me how great the southbeach diet is every time I see her, even though she is also fatter every time I see her.
My family, is far from thin or healthy. My dad has survived colon cancer and two heart attacks. One of the main reason why I started lifting was so I do as much preventative maintenance as I can before I hit his age and hopefully avoid the health problems.
Both my brothers on the other hand are well on their way. They eat shit, are overweight, and don't do much of anything along the lines of physical activity. We used to mountain bike together but they are so out of shape I have to either go so slow it's no fun for me, or they get winded.
My sister is a dance teacher, she dances for 5 hours a night 5 hours a week, her diet is so shit she still can't work off the baby weight from 6 months ago. Seriously, I could eat all the shit I want, and if I danced that often, Baryshnikov would be my bitch and I'd be ripped as shit. It just boggles my mind.