Would you communicate with your ex boyfriend who got a child but single?

My friend got boyfriend of 7 years and he is communicating with her ex boyfriend. and her ex boyfriend admits that he still like my friend. my friend's boyfriend is just fine with his attitudes,its just that he is not responsible enough and dont intend to think of the future. like for 7 years, there are still no plan for marriage.while the ex boyfriend got good career and thinks of future. would she stick with her boyfriend, or accept her ex boyfriend or stay single and no commitment wih anyone?