She Noticed Even if My Family Didn't

My immediate family knows I'm walking and watching my calorie intake. They haven't said one word about how I look. I can wear a size smaller jeans now YAY ME! But nobody in my family has commented. I've been thinking, well, my weight loss must not show. But my girlfriend noticed! I thought oh, that's a girlfriend's obligation to say something about it. But she was serious. I know her well enough to know she wasn't out to make me feel good. She was serious with her compliment.