trying to fix thing but don't know how

the father of my child and l broke up then 4 months after i met this guy and dated for a few months before l found out l was pregnant with my baby girl by my Ex....so the new guy and l just thought we should be friend and see where it goes bc previous ladies that he did date nd they had a kid they would just go back to their baby daddy, I know l dont want to go back with the father to my child we came to know we would be better to co-parent and l want to try and fix what l had with new guy but don't know how to go about it