Loss is unquestionably one of the most painful experiences one can have. There's many different forms of loss. Whatever the loss, it's painful and others don't really want to listen for too long. No one likes feeling sadness and there is no immediate remedy for it. Think about it, for all the other emotions we may have, there's a remedy. Sadness is just something we have to process over time. Consequently, it often goes underground, and when it does, it causes relationship problems, depression, drug abuse, etc.
I did my research and dissertation on loss and I can help you with it. Don't run away from it. Come in and work it out.