Stepdad passed away

My stepdad had diabetes for about 20 years. Recently he died at age 57. I knew him for about 8 years and I am so mad at him for not taking care of it, I feel bad that I am so angry but it feels like he left us. He had a heartattack without even knowing it and was in the icu for a few days and he had two major strokes. I am so heartbroken about it but he wouldn’t listen to us when we said to go to the hospital. Why do I feel so guilty. I felt like I could have persuaded him more to take care of his health. I miss him so much he was like a real dad to me but I can’t even speak to him anymore which breaks my heart so bad, if you have family that is not taking care of their diabetes please let them know how bad it can get, because I think a lot of people don’t know that. I hope this helps people to get a reality check because this is a truly deadly disease. If this helps even anyone to tell their family members or friends to get better this post was worth it.