baby fever

Me and my ex were engaged and together for almost 5 years and tried to have a baby for one year before we broke up. I thought I had no feelings towards him or having a baby.. I don't know what to do. Just found out he's having a baby with a girl he's been with for a couple months. I don't know if I'm upset about him having a baby or that I'm not having a baby.. this night turned to complete shit on top of my depression already...