I don't want to stay in touch with a group of old friends anymore
Why do you want to lose touch with them?
Because they don't talk to me frequently anymore.
I'm sorry this is happening to you, but you shouldn't put all the responsibility on them. Phone calls and texts work both ways. There is enough technology out there today to better communicate with each other.
No, they are bad friends because they wouldn't even text me.
I wouldn't call them bad friends, but maybe you could send them a message first. There should be no excuse in keeping up with old friends due to how easy it is to send a message.