After reading a Doc Love article that basically says you shouldn't get serious with a girl who's still in contact with her ex, I remember that I dated this girl who's close friends with her ex. They broke up 5 years ago because of distance and now they still communicate often, even Skype-ing once in a while. She once told me that they're just close friends and I shouldn't worry. Now I'm not seeing that girl anymore but I'm just curious what should've I done when I knew she's close friends with her ex? And what's the general verdict for girls who're close friends with their exes? Thanks.