I see responses here telling you to drop them.

This can be a red flag to new potential friends that you have no friends if you do that immediately.

It isn’t to me because I was in the same situation and I haven’t had almost any friends for years now. It’s tough to find new friends (especially ones that truly care and show it).

Best I can tell you is drop them if you are prepared to deal with their loss in the future (seeming/being lonely and possibly even depression). After all, it is not good for man to be alone.