Do you think this constitutes them as being a bad friend?
Why do you think they're a bad friend?
If you look at my friends list, you will find that he has quite a few female friends whom I also know.
Friends should be okay with them having the same friends. You may be seen as jealous if you're upset about your friend having the same female friends.
I just hope he doesn't become a cheater with all of them.
You shouldn't assume your friend has any intention of cheating on anyone just because they are female. Your friend is popular and is well liked, try to be happy for their social success.