We had neighbours who lived a few doors away and we spent some good times with them, parties, outings etc, then they moved away. We still kept in touch and visited each other. Now they have split up, he is with someone younger, she is alone. I still phone her, but time and the situation has changed things, my husband still speaks to him but I won't. So I guess they are now considered fair-weather friends, we may see them occasionally (separately) but not like it was before.