Well, chances are that he MIGHT have issues with committing for real with a woman? He might walk away when passion stops, or when difficulties arise? Or that he has been extremely unlucky with his previous spouses. One thing for sure: Our past isn’t speaking about our future. Being a single mom is hard but he might be the one for you! Ask him what was wrong his his past relations, you might get some insights. If he constantly blames his ex’s while telling the stories…then he could have a problem to see his own flaws. If he admits his faults, there’s hope.
I say give it time, nothing has to be decided now no?