Pregnant and feeling lost

I am currently 14 weeks pregnant and I can't get over my ex/ father of my baby. All I wanted was a family, but he left me when I told him I was pregnant and is now dating someone else. But he is still playing mind games and we just had sex last night when we decided to meet to talk (bad move on my part, I know) but now I feel as if I'm right back to square one. Please help, I need some helpful advice on how to either get things right with us or move on in this situation.