What does it mean when you're blaming yourself for someone else's death?

It is natural for feeling guilty, but we must remember no man have ever break the cycle of birth n death before... All we need is the time:)

Sounds like you're in a lot of pain over your loss, I'm so sorry. Tell me about this person and how you are connected to them.

It means that you are trying to stay in control of the situation by implying that you were responsible or had an impact. It is a try of coping with feeling powerless and it stops you from accepting and finding a helpful connection to your feelings to overcome the event.

That you are a normal human being! Everyone I know who has lost someone has had feelings of guilt and responsibility regardless of whether they had anything to do with it or not, including myself! I had to remind myself that I don't have that power - that some things are out of my control and this is one of them. I also try to use that feeling to remind myself not to have regrets in my present relationships. It is a really hard feeling to handle, but my experience is that it doesn't last forever, and if I can wait and focus on other things (like things I enjoyed about the relationship, or even things I will really miss) it helps me get through time until the feeling begins to ease on its own.

you feel responsible and guilty because you weren't there to save them but threes nothing u could do

It can mean you are going through a really rough time. And perhaps you may need to talk to a trusted loved one or a trained counselor or therapist to help you deal with those emotions.