<human>: Recently my girlfriend has been beating herself up about her body and how she looks. She says she has been gaining weight and is disgusted with herself. I personally haven't noticed anything and think she is just overreacting. I love her body and am so physically and emotionally attracted to her and I want to make her feel that way. 

Little things that didn't bother her before, like me becoming friends with a girl on Facebook or liking a picture of someone on Instagram is now getting in her head. She is comparing herself to my exes and saying she will never be as skinny or pretty as them. She points to those things I did as my true feelings and that "actions speak louder than words"

I want her to know she is SO attractive to me and that I love her and wouldn't leave her for any girl in the world, even if there was a supermodel knocking on my door. I need advice or ideas on how to make her feel special and beautiful again because it breaks my heart to see her so down on herself.

Summarize the given text in a few sentences.
<bot>: girlfriend has been comparing herself to exes and beating herself up about her body. How do I reassure her and show her I want HER and only her?