HOW do you help women gain self esteem?

k, so i have been dating my gf for about a year. She has such low self esteem. she seems to think she is not very pretty, obese, dumb, so many more things. But the fact is she is amazing, gorgeous, and smart, and a perfectly healthy fine weight. But no matter how much i tell her all these things she still deep down seems to hate herself. She has dated soooo many and nice guys that turned into s. I feel like no matter what i say it doesn't matter. i can tell her everyday and it seems to make no difference. When we were first going on dates she even told me that a compliment from an hole in a bar meant more than one from a steady bf that she would hear all the time. Why is that? Why when an compliments a girl do they think its the world, but when a nice guy compliments they just think they are nice and that is it. I don't get it. They must know the hole just wants to get in their pants. I think all women are like funnels. You fill them up with compliments and it is never enough, the next day they have drained out and they need more. Please clarify? I honestly wanna know how to help her, I love her and don't want her to look at herself like that anymore. I don't know how to repair the damage her ex's and family members have done.