Somatic symptom disorder- stomach pain

Hello! My ex boyfriend was diagnosed with somatic symptom disorder and depression. He is experiencing different symptoms for almost two years and this started a month after we started our relationship. Can our relationship be the cause of his SSD? I did nothing but support him and give the attention and encouragement to get better, but he says that thinking at me and loving me makes him this way. Nothing bad happened between us. He has this stomach pain that never disappears and many other depression symptoms. He started cognitive behavioral therapy so we broke up for 2 month because that was suggested to him but he is not getting better. Can I be the cause of his suffering? Or what can cause this? Did anyone experienced this and how did you get through this?