What do you when your personality is very deeply affected, because your ex-boyfriend used to tell you that you're not so good looking, and you're short and immature and that he could get almost anybody but sticked out for you. When you feel low and extremely insecure and frustrated, what do you do to forget the things that echo in your head.
I would do things and be with those that boost my self esteem simply by being in their presence. That person was not a real friend or love and his opinions should not be taken to heart. Think of all your abilities and accomplishments, hopes and dreams. When you compare these things to those of your ex you will likely see that it was him that didn't measure up to you. Move forward and busy yourself to forget him.