Single and 4 months pregnant

I am desperate need of a village and advise this momma feels like I will have a soon mental breakdown!! I am 4 months pregnant with my first baby girl after 6 years of being single with a son who has a different dad and we separated after my son was 5 months old… my baby girls dad had literally hung over the possibility of us trying to work though this all to push through for our family to now have discovered he has a whole new girlfriend in Dominican Republic in which he’s never met in person and will soon meet her in January… I am so hurt by this and emotionally a wreck I can’t stop crying and everything in me hurts mommies that are going through being single and pregnant please tell me how you do it I haven’t slept all night and I just keep crying I don’t really know how much of my sadness is my baby girl feeling inside but I just can’t seem to stop feeling down!