I'm working on that, too, but it took me over 6 months to finally do something about it (with my family and friends wanting to kick my butt for being so depressed for someone who's not worthy)
The thing is this person is just average (and by that I mean he's 20 cms shorter than me........ 11 years older..... with a belly..... you know!) , and we were fine until it came a time when he wanted me to become Laetitia Casta . So, I was "very pretty and over the average". He thought I could be "prettier" and I didn't want to change. Hey, models are beautiful, but let's not forget they have a whole staff and photoshop behind them to make them look dreamy.
This made me feel very disappointed of myself, very ugly. I didn't even want to go out because I felt I was so horrible. I didn't even want to go back to school because I felt I wasn't worthy enough to have a career. I didn't even want to live.
It took me a lot to realize about this, because it's something sooo simple: you came across an asshole ! But at that moment you feel you are guilty..... whatever that means
I'm still in contact with this person, although across the distance 'cause we live in different places, and from time to time he torments me with these ideas. Today, an hour ago, I got hurt again, but it helped me and now I'm ready to leave all this behind !