Single parenting is LONELY!!

Being a single mom is the most difficult thing to do in the world. I have a son who is 5. His dad is there sometimes but not always. Hes parents come around if he let's them see our son. I'm pregnant again by someone else. I thought he was different. Before we broke up I didnt k ow I was pregnant and I told him we needed some space. Someone had told me to look him up on the sex offender registry because they heard through a friend that he might be on there. So I did. And what do you know hes on there. He claims that he told me one night when I was drunk but I don't remember. So now I don't want him around because I'm pregnant and I have a son. Am I son's father is so vindictive to the point where he takes me to court for everything even though he doesn't always see his child. When I tell you I'm lonely it doesn't even begin to cover how alone I actually feel.

I don't even know what to do anymore. And I feel like all my friends how gone on with their lives because they don't have kids.