No on else to talk to

The husband and I got into a huge fight this afternoon. He left the house for a while, came back and didn't speak to me until his buddy came over. He put on a good show while he was here, but as soon as he left he stopped speaking to me. He's now sleeping in the other room. And I literally have no one to talk to about it all. I don't even know what to do anymore. I feel like giving up. I feel like the kids and I aren't a priority. He cares more about himself than anything else. Then his job. I'm not even sure if the kids and I make it on the top 5 list. My almost 4 year old son saw me crying today and wanted to know why I was so sad. I felt terrible that he saw me. I just feel so alone, and like neither of us want to try anymore. I can't play happy anymore. I just don't know where to go from here, and I feel so incredibly alone with no one to talk to.