A friend is mourning the loss of long time friend.and needs impartial advice on dealing with it.?

Judy and Mel were off and on lovers for many years and most recently were "off" again. Mel insisted in staying in touch with Judy by phone but never visits or sees her anymore. Judy was hurt about the initial break up that happened 8 years ago and stopped calling Mel. However, Mel called Judy every week to talk about various general events and things that had nothing to do with Judy. Judy never called Mel after the breakup but continued to answer his calls and listen to him and his occasional advice on financial matters. Last week Mel woke Judy up around midnight to talk about what was transpiring with some of his male pals and while Judy was listening to Mel, a call waiting interruption came. Mel had to get off the phone with Judy because he stated one of his male pals who had been sick was expected to call. Mel told Judy just before hanging up "Ill call you back". Mel never called back so Judy became angry, thinking it was one of Mel's newest sexual conquests and she was put on the "back burner". She e-mailed Mel not to ever do that again and she doubted it was his male pal on the line when he had to hang up and did not call back. What should Judy do? What should Mel do? Impartial opinions needed.