I'm so confused

I can't believe it's been over a year since I've added anything in here. I guess I just haven't had much to say. That is until now. It's been 4 years since my sweetie died. I've been doing pretty good with that too until recently.
I recently talked with somebody from my sweetie's family. It seems that every time I talk with her, she keeps telling me I need to move on with my life. Not only is she still telling me this, yet she told me the other day that somebody else in the family wonders why I'm not moving on with my life. 
Yet, what I don't understand is the fact that my sweetie's younger brother keeps telling me I'm family, calls me with family news, invites me to family functions throughout the year. I'm getting to the point to where I want to ask this younger brother to come by the house for a private talk to find out exactly what's going on. I don't want to create waves here, yet I'm getting sick and tired of crying all the time. 
There are a few reasons why I'm so sad over this is due to I feel like I'm losing my sweetie all over again, that my only son is now gone, my only sibling and both of my parents are gone and I'm all alone in this world. Being apart of my sweetie's family gives me the sense of belonging somewhere. I'm a strong believer that people need to feel as though they belong somewhere. 
I thought I had friends, tried to get together with them, yet they keep telling me "let's get together later. Right now isn't the best time to do it now." I try contacting them again, but I keep getting the same sad story as before. I feel so lost, so alone and beside myself. 
Is it me? What am I doing wrong? I wonder if others are going through something like this? I've been crying nonstop now for about a week now.