Abandoned friendship

Its when two people have a really good and tight friendship and that out of nowhere they start ignoring each other and lose that amazing relationship they had. They lose every thing without noticing at first but only when they realise they are alone and they miss their old friendships but there is no way back.

Person 1: It's really sad they don't talk to each other anymore.

Person 2: Yeah! They used to be such good friends.
Person 3: They have an abandoned friendship and it's really heart breaking...