I think people just don't what to say or do. So they just avoid the situation. They know that there isn't really anything they can do to fix your situation. Until they have been through a difficult time, they won't understand that just listening is a big help to a person in distress.
Because they don't really want to face the facts and are too wrapped up in their own lives to bother with yours. Sad, but true fact. It's during these times that you really know who your true friends are and who is just a part time friend. Some people just don't like to face reality when things like this happen. I'm sorry for your loss.
They don't know what to say, don't know how to act, can't look you in the eye, don't know whether to smile or not...the easiest thing for them to do is to just avoid you. It seems cowardly but it's just human nature.
When my father died I wondered the same thing. It was like people didn't know what to say or do around me. Almost like my loss was a contagious disease. Because of that treatment when I was only 24, I vowed that when it came to death I would always be honest. I thought that had someone said, "I just don't know what to say or do for you." That that was far better than to act like my heart had not just been ripped out of my chest. Death is a difficult thing, people don't like being uncomfortable. It's sad but true. Wait until those same people want to know why you aren't over your loss yet. Even though it's only been a month or two or a year. Ignore them, they are idiots. When they suffer a devastating loss remember what was done to you and do for them that which was not done for you.
I've missed you Ravin Local. I'm so sorry for your loss.
Ravin Local, my heart is with you.