Why do I have to feel so alone?

Why does it feel like I'm all alone? The one person I thought was my companion for life has moved on it seems. What did I do that was so wrong? Should I even beat myself up trying to figure it out? I thought that if I offered my love and commitment to her it would come back. I guess I was wrong. Lately it seems that I have been wrong about most things. People are selfish. This shouldn't come as a surprise to me, but I never realized that they were this selfish. I wish that I was a kid again. Watching my kids makes me envious. Why can't I have that again?