My husband keeps going back to his exes,checking on them and always want to reminisce on the past…

My husband keeps going back to his exes,checking on them and always want to reminisce on the past with them and how "if he didn't fuck up he could have married them".... It gets exhausting. It's our monthly fight everyone he finds a different ex to entertain... as a mother having to take a small to your little one and pretend everything is fine is just exhausting