single mother

My boyfriend do not defend me. He defend his ex and his family except me. We don't have much communication. He talk a lot with his ex wife than me. Sound like he doesn't love me. He do not want to admit that he is the father of my 4.5 month old baby boy. He looks like him a lot. 
So he left me...now I'm single mother, but scared to be alone and don't know where to start.  But good thing that went back to work after maternity leave.