Feel as if I can't live without my ex. getting unwell physically. please help

Girl on the web

I commited to him last year when he said he promised we would always be together. he broke up with me but I cannot let go. I want to look after him and be by his side in life but also I feel I must because I commited to him. Thing is we are broken up now since last year, I started getting unwell in August and in January more so. I got diagnosed with conversion disorder. now I'm better but have pain in my body a lot mentally and physically and I'm thinking is it because I am not doing what I'm supposed to by staying by his side that I'm getting unwell? I honestly think I cannot live without him for very long. not more than 2 years.