How can I get my ex back?

My ex & I had dated for 2 years! We broke up almost 2 months ago. I'm currently 8 months pregnant & we're expecting a baby boy in 6 weeks! I miss him so much. We still laugh & have fun together. I'd really like to get back together with him. He expressed months ago that he no longer wanted to be with me & that he wouldn't mind if I started seeing someone else but I don't think that's 100% true! What do I do? He says we only still feel connected because we are having a child together.