How to not compare myself to his ex?

Hey, I've been with my boyfriend for three years now, but I'm insanely envious of his ex. She's gorgeous and she has more friends and seems a lovely person and I can't match her. I'm a fat, ugly, horrendous mess and everytime I look at her Facebook profile I feel sick at myself, knowing that my boyfriend can't possibly really love me as much as he loved her because she is everything I am not. We've been together for three years, for the first year he constantly talked about her. After he took my virginity, he talked about her. Every thing I did was affected by her. I slowly started spiralling and now I've lost all confidence. I'm trying to lose weight. I'm trying to dress better and be better but I can't ever beat her. All her profile photos has friends telling her how gorgeous she is and how lucky her current boyfriend is to have her. I feel like my current boyfriend doesn't appreciate me or love me at all. I feel so lonely. What do I do to get her out of my head. Every day for three years, I can't take it, I want my confidence back. Please what do I do? :(

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