I was with this girl for 5-6 months. I got her while she was having a relationship with her ex-bf. I was insecure and needy. Eventually I lost her 4 months ago. I lost my self esteem and confidence - the feeling of not worthy of being loved. Now she's with another guy, and it pisses me off seeing that she is with that guy who is her best friends of three years. I am lost. I cannot concentrate on work. I always think of her. I really don't know what to do. I want to get her back but I don't think it is possible.